After running this setting I recently just started getting start up crashes at random times of starting up the game (doesn't happen on every start)...
`[20:06:08] [main/INFO] [LaunchWrapper]: Launching wrapped minecraft {net.minecraft.client.main.Main}
[20:06:09] [main/INFO] [STDOUT]: [pl.asie.foamfix.coremod.FoamFixTransformer:spliceClasses:112]: Added INTERFACE: pl/asie/foamfix/coremod/patches/IFoamFixWorldRemovable
[20:06:09] [main/INFO] [STDOUT]: [pl.asie.foamfix.coremod.FoamFixTransformer:spliceClasses:149]: Added METHOD: net.minecraft.world.World.foamfix_removeUnloadedEntities
[20:06:09] [main/INFO] [EnderCore ASM]: Transforming net.minecraft.entity.player.EntityPlayer finished, added func_184613_cA() overriding EntityLivingBase
[20:06:09] [main/INFO] [STDOUT]: [pl.asie.foamfix.coremod.patches.WorldServerRemovalPatch:apply:65]: Patched updateEntities in net/minecraft/world/WorldServer func_72939_s
[20:06:09] [main/INFO] [STDOUT]: [pl.asie.foamfix.coremod.FoamFixTransformer:spliceClasses:125]: Spliced in METHOD: net.minecraft.client.util.SearchTreeManager.func_110549_a
[20:06:09] [main/INFO] [minecraft/Minecraft]: Setting user: MineFriendly
[20:06:10] [main/INFO] [STDOUT]: [pl.asie.foamfix.coremod.FoamFixTransformer:spliceClasses:125]: Spliced in METHOD: net.minecraft.block.state.BlockStateContainer.createState
[20:06:10] [main/INFO] [STDOUT]: [pl.asie.foamfix.coremod.FoamFixTransformer:spliceClasses:125]: Spliced in METHOD: net.minecraft.block.properties.PropertyEnum.equals
[20:06:10] [main/INFO] [STDOUT]: [pl.asie.foamfix.coremod.FoamFixTransformer:spliceClasses:125]: Spliced in METHOD: net.minecraft.block.properties.PropertyEnum.hashCode
[20:06:10] [main/INFO] [STDOUT]: [pl.asie.foamfix.coremod.FoamFixTransformer:spliceClasses:172]: Added FIELD: net.minecraft.block.properties.PropertyEnum.foamfix_hashCode
[20:06:10] [main/INFO] [STDOUT]: [pl.asie.foamfix.coremod.FoamFixTransformer:spliceClasses:172]: Added FIELD: net.minecraft.block.properties.PropertyEnum.foamfix_hashCode_calced
[20:06:10] [main/INFO] [STDOUT]: [pl.asie.foamfix.coremod.FoamFixTransformer:spliceClasses:125]: Spliced in METHOD: net.minecraft.block.properties.PropertyInteger.hashCode
[20:06:10] [main/INFO] [STDOUT]: [pl.asie.foamfix.coremod.FoamFixTransformer:spliceClasses:172]: Added FIELD: net.minecraft.block.properties.PropertyInteger.foamfix_hashCode
[20:06:10] [main/INFO] [STDOUT]: [pl.asie.foamfix.coremod.FoamFixTransformer:spliceClasses:172]: Added FIELD: net.minecraft.block.properties.PropertyInteger.foamfix_hashCode_calced
[20:06:10] [main/INFO] [STDOUT]: [pl.asie.foamfix.coremod.FoamFixTransformer:spliceClasses:125]: Spliced in METHOD: net.minecraft.block.properties.PropertyBool.equals
[20:06:10] [main/INFO] [STDOUT]: [pl.asie.foamfix.coremod.FoamFixTransformer:spliceClasses:125]: Spliced in METHOD: net.minecraft.block.properties.PropertyBool.hashCode
[20:06:10] [main/INFO] [STDOUT]: [pl.asie.foamfix.coremod.FoamFixTransformer:spliceClasses:125]: Spliced in METHOD: net.minecraft.tileentity.TileEntity.func_190559_a
[20:06:10] [main/INFO] [STDOUT]: [pl.asie.foamfix.coremod.FoamFixTransformer:spliceClasses:125]: Spliced in METHOD: net.minecraft.block.BlockBed.func_189540_a
[20:06:11] [main/INFO] [STDOUT]: [pl.asie.patchy.helpers.ConstructorReplacingTransformer$FFMethodVisitor:visitTypeInsn:75]: Replaced NEW for net/minecraft/tileentity/TileEntityHopper to pl/asie/foamfix/common/TileEntityFasterHopper
[20:06:11] [main/INFO] [STDOUT]: [pl.asie.patchy.helpers.ConstructorReplacingTransformer$FFMethodVisitor:visitMethodInsn:87]: Replaced INVOKESPECIAL for net/minecraft/tileentity/TileEntityHopper to pl/asie/foamfix/common/TileEntityFasterHopper
[20:06:12] [main/INFO] [EnderCore ASM]: Transforming Class [net.minecraft.entity.ai.EntityAICreeperSwell], Method [func_75246_d]
[20:06:12] [main/INFO] [EnderCore ASM]: Transforming net.minecraft.entity.ai.EntityAICreeperSwell Finished.
[20:06:12] [main/INFO] [STDOUT]: [pl.asie.foamfix.coremod.patches.EntityDataManagerPatch:apply:69]: Replaced Maps.newHashMap() in net/minecraft/network/datasync/EntityDataManager
[20:06:13] [main/INFO] [EnderCore ASM]: Transforming Class [net.minecraft.inventory.ContainerFurnace], Method [func_82846_b]
[20:06:13] [main/INFO] [EnderCore ASM]: Transforming net.minecraft.inventory.ContainerFurnace Finished.
[20:06:13] [main/WARN] [minecraft/GameSettings]: Skipping bad option: lastServer:
[20:06:13] [main/INFO] [minecraft/Minecraft]: LWJGL Version: 2.9.4
[20:06:14] [main/INFO] [FML]: -- System Details --
Details:
Minecraft Version: 1.12.2
Operating System: Linux (amd64) version 4.15.0-34-generic
Java Version: 1.8.0_181, Oracle Corporation
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 482911064 bytes (460 MB) / 661127168 bytes (630 MB) up to 954728448 bytes (910 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML:
Loaded coremods (and transformers):
CoreMod (Aroma1997Core-1.12.2-2.0.0.0.jar)

Do not report to Forge! (If you haven't disabled the FoamFix coremod, try disabling it in the config! Note that this bit of text will still appear.) (foamfix-0.10.2-1.12.2.jar)
pl.asie.foamfix.coremod.FoamFixTransformer
EnderCorePlugin (EnderCore-1.12.2-0.5.39.jar)
com.enderio.core.common.transform.EnderCoreTransformer
com.enderio.core.common.transform.SimpleMixinPatcher
RandomPatches (randompatches-1.12.2-1.5.0.4.jar)
com.therandomlabs.randompatches.core.RPTransformer
GL info: ' Vendor: 'X.Org' Version: '3.0 Mesa 18.0.5' Renderer: 'AMD KAVERI (DRM 2.50.0 / 4.15.0-34-generic, LLVM 6.0.0)'`

Looks like back to the drawing broad for me until this setting is looked into more.

That's no crash, and I don't even know which setting you turned on.

Then would it just be a forced exit then? Because my game did failed to load sometimes.

Also the setting I meant was the entitydatamanage one. I thought this line would had given that away...
"[20:06:12] [main/INFO] [STDOUT]: [pl.asie.foamfix.coremod.patches.EntityDataManagerPatch:apply:69]: Replaced Maps.newHashMap() in net/minecraft/network/datasync/EntityDataManager"

As when it not on it won't cause the forced exiting or whatever.

Generally, the experimental options are not supported and are rather YMMV/for advanced users. That would be a forced exit, or your log is incomplete.

I see, but it said right on the tooltip to report them so that what I am doing...

Indeed. However, "not being able to load the game with no crash report" isn't particularly helpful when I cannot reproduce it.

I am sorry but it literally did not produce a crash report.

Again... If you want to fiddle with it until it does, be my guest - if you don't, just move on and focus on more enjoyable things in life. I do appreciate you trying to test it, but I unfortunately can't do much with the information you have given me. I haven't touched the feature in months and probably won't until 1.13 regardless...

Also, sorry for disappointing. I left the comment in more with modders/developers in mind, as the feature used to be turned on by default but started causing strange bugs I couldn't get to the bottom of.

I see, thanks for helping me understand that.