Game instantly crashed when just flying around an area, chash report didn't genereted, so I post last parts of log. This is not first time similar situation happens.

[15wrz2021 23:59:59.350] [Render thread/INFO] [STDOUT/]: [cam72cam.mod.sound.ClientSound:checkErr:45]: OpenAL Error 40965 : java.lang.Throwable
at cam72cam.mod.sound.ClientSound.checkErr(ClientSound.java:45)
at cam72cam.mod.sound.ClientSound.init(ClientSound.java:56)
at cam72cam.mod.sound.ClientSound.play(ClientSound.java:89)
at cam72cam.immersiverailroading.entity.EntityMoveableRollingStock.onTick(EntityMoveableRollingStock.java:260)
at cam72cam.immersiverailroading.entity.EntityCoupleableRollingStock.onTick(EntityCoupleableRollingStock.java:154)
at cam72cam.mod.entity.ModdedEntity.func_70071_h_(ModdedEntity.java:217)
at net.minecraft.client.world.ClientWorld.func_217418_a(ClientWorld.java:252)
at net.minecraft.world.World.func_217390_a(World.java:554)
at net.minecraft.client.world.ClientWorld.func_217419_d(ClientWorld.java:210)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1483)
at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:953)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:607)
at net.minecraft.client.main.Main.main(Main.java:184)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51)
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37)
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54)
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72)
at cpw.mods.modlauncher.Launcher.run(Launcher.java:82)
at cpw.mods.modlauncher.Launcher.main(Launcher.java:66)

[15wrz2021 23:59:59.350] [Render thread/INFO] [STDOUT/]: [cam72cam.mod.sound.ClientSound:checkErr:45]: OpenAL Error 40965 : java.lang.Throwable
at cam72cam.mod.sound.ClientSound.checkErr(ClientSound.java:45)
at cam72cam.mod.sound.ClientSound.init(ClientSound.java:56)
at cam72cam.mod.sound.ClientSound.play(ClientSound.java:89)
at cam72cam.immersiverailroading.entity.EntityMoveableRollingStock.onTick(EntityMoveableRollingStock.java:271)
at cam72cam.immersiverailroading.entity.EntityCoupleableRollingStock.onTick(EntityCoupleableRollingStock.java:154)
at cam72cam.mod.entity.ModdedEntity.func_70071_h_(ModdedEntity.java:217)
at net.minecraft.client.world.ClientWorld.func_217418_a(ClientWorld.java:252)
at net.minecraft.world.World.func_217390_a(World.java:554)
at net.minecraft.client.world.ClientWorld.func_217419_d(ClientWorld.java:210)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1483)
at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:953)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:607)
at net.minecraft.client.main.Main.main(Main.java:184)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51)
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37)
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54)
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72)
at cpw.mods.modlauncher.Launcher.run(Launcher.java:82)
at cpw.mods.modlauncher.Launcher.main(Launcher.java:66)

[15wrz2021 23:59:59.351] [Render thread/INFO] [STDOUT/]: [cam72cam.mod.sound.ClientSound:checkErr:45]: OpenAL Error 40965 : java.lang.Throwable
at cam72cam.mod.sound.ClientSound.checkErr(ClientSound.java:45)
at cam72cam.mod.sound.ClientSound.init(ClientSound.java:56)
at cam72cam.mod.sound.ClientSound.play(ClientSound.java:89)
at cam72cam.immersiverailroading.entity.EntityMoveableRollingStock.onTick(EntityMoveableRollingStock.java:260)
at cam72cam.immersiverailroading.entity.EntityCoupleableRollingStock.onTick(EntityCoupleableRollingStock.java:154)
at cam72cam.immersiverailroading.entity.FreightTank.onTick(FreightTank.java:138)
at cam72cam.immersiverailroading.entity.Locomotive.onTick(Locomotive.java:153)
at cam72cam.immersiverailroading.entity.LocomotiveDiesel.onTick(LocomotiveDiesel.java:146)
at cam72cam.mod.entity.ModdedEntity.func_70071_h_(ModdedEntity.java:217)
at net.minecraft.client.world.ClientWorld.func_217418_a(ClientWorld.java:252)
at net.minecraft.world.World.func_217390_a(World.java:554)
at net.minecraft.client.world.ClientWorld.func_217419_d(ClientWorld.java:210)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1483)
at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:953)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:607)
at net.minecraft.client.main.Main.main(Main.java:184)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51)
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37)
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54)
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72)
at cpw.mods.modlauncher.Launcher.run(Launcher.java:82)
at cpw.mods.modlauncher.Launcher.main(Launcher.java:66)

[15wrz2021 23:59:59.351] [Render thread/INFO] [STDOUT/]: [cam72cam.mod.sound.ClientSound:checkErr:45]: OpenAL Error 40965 : java.lang.Throwable
at cam72cam.mod.sound.ClientSound.checkErr(ClientSound.java:45)
at cam72cam.mod.sound.ClientSound.init(ClientSound.java:56)
at cam72cam.mod.sound.ClientSound.play(ClientSound.java:89)
at cam72cam.immersiverailroading.entity.EntityMoveableRollingStock.onTick(EntityMoveableRollingStock.java:271)
at cam72cam.immersiverailroading.entity.EntityCoupleableRollingStock.onTick(EntityCoupleableRollingStock.java:154)
at cam72cam.immersiverailroading.entity.FreightTank.onTick(FreightTank.java:138)
at cam72cam.immersiverailroading.entity.Locomotive.onTick(Locomotive.java:153)
at cam72cam.immersiverailroading.entity.LocomotiveDiesel.onTick(LocomotiveDiesel.java:146)
at cam72cam.mod.entity.ModdedEntity.func_70071_h_(ModdedEntity.java:217)
at net.minecraft.client.world.ClientWorld.func_217418_a(ClientWorld.java:252)
at net.minecraft.world.World.func_217390_a(World.java:554)
at net.minecraft.client.world.ClientWorld.func_217419_d(ClientWorld.java:210)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1483)
at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:953)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:607)
at net.minecraft.client.main.Main.main(Main.java:184)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51)
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37)
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54)
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72)
at cpw.mods.modlauncher.Launcher.run(Launcher.java:82)
at cpw.mods.modlauncher.Launcher.main(Launcher.java:66)

[15wrz2021 23:59:59.358] [Render thread/INFO] [STDOUT/]: [cam72cam.mod.sound.ClientSound:checkErr:45]: OpenAL Error 40965 : java.lang.Throwable
at cam72cam.mod.sound.ClientSound.checkErr(ClientSound.java:45)
at cam72cam.mod.sound.ClientSound.init(ClientSound.java:56)
at cam72cam.mod.sound.ClientSound.play(ClientSound.java:89)
at cam72cam.immersiverailroading.entity.EntityMoveableRollingStock.onTick(EntityMoveableRollingStock.java:260)
at cam72cam.immersiverailroading.entity.EntityCoupleableRollingStock.onTick(EntityCoupleableRollingStock.java:154)
at cam72cam.mod.entity.ModdedEntity.func_70071_h_(ModdedEntity.java:217)
at net.minecraft.client.world.ClientWorld.func_217418_a(ClientWorld.java:252)
at net.minecraft.world.World.func_217390_a(World.java:554)
at net.minecraft.client.world.ClientWorld.func_217419_d(ClientWorld.java:210)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1483)
at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:953)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:607)
at net.minecraft.client.main.Main.main(Main.java:184)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51)
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37)
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54)
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72)
at cpw.mods.modlauncher.Launcher.run(Launcher.java:82)
at cpw.mods.modlauncher.Launcher.main(Launcher.java:66)

[15wrz2021 23:59:59.359] [Render thread/INFO] [STDOUT/]: [cam72cam.mod.sound.ClientSound:checkErr:45]: OpenAL Error 40965 : java.lang.Throwable
at cam72cam.mod.sound.ClientSound.checkErr(ClientSound.java:45)
at cam72cam.mod.sound.ClientSound.init(ClientSound.java:56)
at cam72cam.mod.sound.ClientSound.play(ClientSound.java:89)
at cam72cam.immersiverailroading.entity.EntityMoveableRollingStock.onTick(EntityMoveableRollingStock.java:271)
at cam72cam.immersiverailroading.entity.EntityCoupleableRollingStock.onTick(EntityCoupleableRollingStock.java:154)
at cam72cam.mod.entity.ModdedEntity.func_70071_h_(ModdedEntity.java:217)
at net.minecraft.client.world.ClientWorld.func_217418_a(ClientWorld.java:252)
at net.minecraft.world.World.func_217390_a(World.java:554)
at net.minecraft.client.world.ClientWorld.func_217419_d(ClientWorld.java:210)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1483)
at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:953)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:607)
at net.minecraft.client.main.Main.main(Main.java:184)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51)
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37)
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54)
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72)
at cpw.mods.modlauncher.Launcher.run(Launcher.java:82)
at cpw.mods.modlauncher.Launcher.main(Launcher.java:66)

I'm not sure but there may be problem with Optifine option "Render Regions". Since I turned it off I didn't have any crash like that.

I'm not sure but there may be problem with Optifine option "Render Regions". Since I turned it off I didn't have any crash like that.

I'm having a similar unexplained crash that I may blame on Out of Sight, knowing about this. Maybe the mod doesn't like it when something's being culled?

Don't follow what @BugfinderGameCrasher said

What? Why? I know a lot of people who use Optifine and turning off VBOs fixes a bug when trying to view or load any track, blueprint or otherwise

The issue in that log is related to sound, not rendering, hence why disabling VBOs is not a solution. For the majority of systems, it's can hinder performance to disable them.

cha0sbuster, you can disable the emails by unsubscribing from notifications on the right side of this thread.

Try turning off VBOs

Do you have the part of the log where you join the world? i had an issue that didn't generate a crash report with optifine on a different modpack and if it is the same issue then i might be of some help

I'm not an expert in reading logs, I'm not sure where loading world part certainly starts, but I think it's somewhere here: https://pastebin.com/SwxjBsUb

I should also add that I removed and added some mods since then and this bug don't happen to me anymore, but I think Render Regions mentioned before may have influence on that.

Fixed in the test builds