I found that except for the first time it's a normal player after the second time onwards the container for the player is null (yes, this will be output a million times?). If I return false when the player is null, I get another bug.
---- Minecraft Crash Report ----
// Hey, that tickles! Hehehe!

Time: 2024/11/28 ����11:14
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
at java.util.Objects.requireNonNull(Objects.java:209) ~[?:?] {re:mixin}
at java.util.Optional.of(Optional.java:113) ~[?:?] {re:mixin}
at net.ltxprogrammer.changed.client.renderer.SpecialLatexRenderer.runIfValid(SpecialLatexRenderer.java:90) ~[%2385!/:?] {re:classloading}
at net.ltxprogrammer.changed.client.renderer.SpecialLatexRenderer.getModel(SpecialLatexRenderer.java:120) ~[%2385!/:?] {re:classloading}
at net.minecraft.client.Camera.adjustAnimForEntity(Camera.java:545) ~[forge-1.18.2-40.2.4_mapped_official_1.18.2.jar%2380!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:changed.mixins.json:render.CameraMixin,pl:mixin:APP:playerAnimator-common.mixins.json:firstPerson.CameraAccessor,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.Camera.md378a53$lambda$animateCamera$0$1(Camera.java:610) ~[forge-1.18.2-40.2.4_mapped_official_1.18.2.jar%2380!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:changed.mixins.json:render.CameraMixin,pl:mixin:APP:playerAnimator-common.mixins.json:firstPerson.CameraAccessor,pl:mixin:A,pl:runtimedistcleaner:A}
at net.ltxprogrammer.changed.process.ProcessTransfur.ifPlayerTransfurred(ProcessTransfur.java:475) ~[%2385!/:?] {re:mixin,re:classloading}
at net.minecraft.client.Camera.handler$zdl000$animateCamera(Camera.java:609) ~[forge-1.18.2-40.2.4_mapped_official_1.18.2.jar%2380!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:changed.mixins.json:render.CameraMixin,pl:mixin:APP:playerAnimator-common.mixins.json:firstPerson.CameraAccessor,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.Camera.setup(Camera.java:60) ~[forge-1.18.2-40.2.4_mapped_official_1.18.2.jar%2380!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:changed.mixins.json:render.CameraMixin,pl:mixin:APP:playerAnimator-common.mixins.json:firstPerson.CameraAccessor,pl:mixin:A,pl:runtimedistcleaner:A}
at org.vivecraft.client_vr.render.XRCamera.setup(XRCamera.java:19) ~[vivecraft-667903-5830810_mapped_official_1.18.2.jar%2393!/:?] {re:mixin,re:classloading}
at net.minecraft.client.renderer.GameRenderer.renderLevel(GameRenderer.java:1047) ~[forge-1.18.2-40.2.4_mapped_official_1.18.2.jar%2380!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:changed.mixins.json:render.GameRendererMixin,pl:mixin:APP:vivecraft.mixins.json:client_vr.renderer.GameRendererVRMixin,pl:mixin:APP:vivecraft.optifine.mixins.json:OptifineGamerRendererVRMixin,pl:mixin:APP:vivecraft.forge.mixins.json:ForgeGameRendererVRMixin,pl:mixin:APP:mixins.oculus.json:GameRendererAccessor,pl:mixin:APP:mixins.oculus.json:MixinGameRenderer,pl:mixin:APP:mixins.oculus.json:MixinModelViewBobbing,pl:mixin:APP:mixins.oculus.json:MixinTweakFarPlane,pl:mixin:APP:mixins.oculus.json:MixinGameRenderer_NightVisionCompat,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.renderer.GameRenderer.render(GameRenderer.java:835) ~[forge-1.18.2-40.2.4_mapped_official_1.18.2.jar%2380!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:changed.mixins.json:render.GameRendererMixin,pl:mixin:APP:vivecraft.mixins.json:client_vr.renderer.GameRendererVRMixin,pl:mixin:APP:vivecraft.optifine.mixins.json:OptifineGamerRendererVRMixin,pl:mixin:APP:vivecraft.forge.mixins.json:ForgeGameRendererVRMixin,pl:mixin:APP:mixins.oculus.json:GameRendererAccessor,pl:mixin:APP:mixins.oculus.json:MixinGameRenderer,pl:mixin:APP:mixins.oculus.json:MixinModelViewBobbing,pl:mixin:APP:mixins.oculus.json:MixinTweakFarPlane,pl:mixin:APP:mixins.oculus.json:MixinGameRenderer_NightVisionCompat,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.runTick(Minecraft.java:1046) ~[forge-1.18.2-40.2.4_mapped_official_1.18.2.jar%2380!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:computing_frames,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:changed.mixins.json:client.MinecraftMixin,pl:mixin:APP:bettercombat.mixins.json:client.MinecraftClientAccessor,pl:mixin:APP:bettercombat.mixins.json:client.MinecraftClientInject,pl:mixin:APP:architectury.mixins.json:MixinMinecraft,pl:mixin:APP:rubidium.mixins.json:core.MixinMinecraftClient,pl:mixin:APP:vivecraft.mixins.json:client_vr.MinecraftVRMixin,pl:mixin:APP:vivecraft.forge.mixins.json:ForgeMinecraftVRMixin,pl:mixin:APP:mixins.oculus.json:MixinMinecraft_Keybinds,pl:mixin:APP:mixins.oculus.json:MixinMinecraft_Images,pl:mixin:APP:mixins.oculus.json:MixinMinecraft_PipelineManagement,pl:mixin:APP:modernfix-common.mixins.json:bugfix.concurrency.MinecraftMixin,pl:mixin:APP:modernfix-common.mixins.json:bugfix.world_leaks.MinecraftMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.blast_search_trees.MinecraftMixin,pl:mixin:APP:modernfix-common.mixins.json:devenv.MinecraftMixin,pl:mixin:APP:modernfix-common.mixins.json:feature.measure_time.MinecraftMixin,pl:mixin:APP:modernfix-forge.mixins.json:feature.measure_time.MinecraftMixin_Forge,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.run(Minecraft.java:665) ~[forge-1.18.2-40.2.4_mapped_official_1.18.2.jar%2380!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:computing_frames,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:changed.mixins.json:client.MinecraftMixin,pl:mixin:APP:bettercombat.mixins.json:client.MinecraftClientAccessor,pl:mixin:APP:bettercombat.mixins.json:client.MinecraftClientInject,pl:mixin:APP:architectury.mixins.json:MixinMinecraft,pl:mixin:APP:rubidium.mixins.json:core.MixinMinecraftClient,pl:mixin:APP:vivecraft.mixins.json:client_vr.MinecraftVRMixin,pl:mixin:APP:vivecraft.forge.mixins.json:ForgeMinecraftVRMixin,pl:mixin:APP:mixins.oculus.json:MixinMinecraft_Keybinds,pl:mixin:APP:mixins.oculus.json:MixinMinecraft_Images,pl:mixin:APP:mixins.oculus.json:MixinMinecraft_PipelineManagement,pl:mixin:APP:modernfix-common.mixins.json:bugfix.concurrency.MinecraftMixin,pl:mixin:APP:modernfix-common.mixins.json:bugfix.world_leaks.MinecraftMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.blast_search_trees.MinecraftMixin,pl:mixin:APP:modernfix-common.mixins.json:devenv.MinecraftMixin,pl:mixin:APP:modernfix-common.mixins.json:feature.measure_time.MinecraftMixin,pl:mixin:APP:modernfix-forge.mixins.json:feature.measure_time.MinecraftMixin_Forge,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.main.Main.main(Main.java:205) ~[forge-1.18.2-40.2.4_mapped_official_1.18.2.jar%2380!/:?] {re:classloading,re:mixin,pl:runtimedistcleaner:A,pl:mixin:A,pl:runtimedistcleaner:A}
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] {}
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?] {}
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?] {}
at java.lang.reflect.Method.invoke(Method.java:569) ~[?:?] {re:mixin}
at net.minecraftforge.fml.loading.targets.ForgeClientUserdevLaunchHandler.lambda$launchService$0(ForgeClientUserdevLaunchHandler.java:24) ~[fmlloader-1.18.2-40.2.4.jar%230!/:?] {}
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-9.1.3.jar%2313!/:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) [modlauncher-9.1.3.jar%2313!/:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) [modlauncher-9.1.3.jar%2313!/:?] {}
at cpw.mods.modlauncher.Launcher.run(Launcher.java:106) [modlauncher-9.1.3.jar%2313!/:?] {}
at cpw.mods.modlauncher.Launcher.main(Launcher.java:77) [modlauncher-9.1.3.jar%2313!/:?] {}
at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) [modlauncher-9.1.3.jar%2313!/:?] {}
at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) [modlauncher-9.1.3.jar%2313!/:?] {}
at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:149) [bootstraplauncher-1.0.0.jar:?] {}

Ideally you should get an error saying “you don't have a special form” or something like that.