[Bug]: fastCollisions enabled makes mobs spawn one block lower, into the ground.

[ThommyaVV]

Describe the bug you're experiencing

Most or all mobs spawn one block lower than expected, and is stuck in the ground block. This is when fastCollisions = true

It could be a mod incompatibility, I just thought I would make it known this issue can exist

Reproducability

Load world with fastCollisions = true
Load Forge with these mods:

            mowziesmobs-1.5.27.jar
	blue_skies-1.16.5-1.1.3.jar
	AoA3-1.16.5-3.6.11.jar
	jei-1.16.5-7.7.1.137.jar
	chaosawakens-1.16.5-0.11.0.1.jar 
	extrabows-v1.16.4+b3.jar   
	Mekanism-1.16.5-10.1.2.457.jar  
	dynamiclights-1.16.5.1.jar    
	invtweaks-1.16.4-1.0.1.jar
	InsaneLib-1.4.2-mc1.16.5.jar
	Space-BossTools-1.16.5-5.5e.jar
	journeymap-1.16.5-5.8.5p6.jar
	CTM-MC1.16.1-1.1.2.6.jar 
	citadel-1.8.1-1.16.5.jar
	appliedenergistics2-8.4.7.jar
	u_team_core-1.16.5-3.2.1.258.jar
	buildinggadgets-1.16.5-3.8.4-build.25+mc1.16.5.jar
	Morpheus-1.16.5-4.2.70.jar
	iceandfire-2.1.12-1.16.5-patch-1.jar
	iChunUtil-1.16.5-10.7.0.jar
	gunswithoutroses-1.16.5-1.0.9.jar 
	MegaMeteors+1.2.7+[1.16.5].jar   
	forge-1.16.5-36.2.34-universal.jar 
	TheDirtyStuff_1.16.5_v.1.3.jar  
	betterendforge-1.16.5-1.6.3.jar     
	structure_gel-1.16.5-1.7.8.jar   
	ironchest-1.16.5-11.2.21.jar       
	infernalmobs-1.16.2.1.jar           
	BetterPingDisplay-1.16.5-1.0.jar     
	forge-1.16.5-36.2.34-server.jar     
	TConstruct-1.16.5-3.3.4.335.jar   
	industrial-foregoing-1.16.5-3.2.14.7-16.jar  
	useful_backpacks-1.16.5-1.12.1.103.jar      
	WitherUtilsCutter-1.16.5-r101.jar   
	MouseTweaks-2.14-mc1.16.2.jar     
	titanium-1.16.5-3.2.8.7-22.jar         
	MoreBows-1.0.12+1.16.x.forge.jar 
	getittogetherdrops-1.16.5-v1.2.jar    
	BiomesOPlenty-1.16.5-13.1.0.485-universal.jar   
	Jade-1.16.4-2.8.2.jar                 
	ChickenChunks-1.16.5-2.9.1.89-universal.jar
	bettercompat-0.4.2-1.16.5-36.2.34.jar  
	jeiintegration_1.16.5-7.1.0.22.jar  
	L_Enders+Cataclysm-0.48+Changed+Theme+-1.16.5.jar 
	SpartanShields-1.16.5-2.1.2.jar   
	Mantle-1.16.5-1.6.157.jar     
	polymorph-forge-1.16.5-0.41.jar   
	performant-1.16.2-5-4.1m.jar        
	ToughAsNails-1.16.5-4.1.0.9-universal.jar  
	Chunk+Pregenerator-1.16-3.6.4.jar       
	Wesley's+Roguelike+Dungeons+V2.0+BETA.jar     
	TheAbyss2+2.2.3-4+1.16.5.jar          
	appleskin-forge-mc1.16.x-2.4.0.jar     
	enhancedcelestials-2.0.9-1.16.5.jar      
	EnhancedAI-1.2.3-mc1.16.5.jar             
	bwncr-1.16.5-3.10.16.jar                   
	letmedespawn-forge-1.16-1.0.2a.jar       
	FastLeafDecay-v25.2.jar                  
	CodeChickenLib-1.16.5-4.0.7.445-universal.jar  
	EnderStorage-1.16.5-2.8.0.170-universal.jar 
	CBMultipart-1.16.5-3.0.4.123-universal.jar 
	ProjectRed-1.16.5-4.15.0-core.jar    
	ProjectRed-1.16.5-4.15.0-transmission.jar    
	ProjectRed-1.16.5-4.15.0-expansion.jar         
	ProjectRed-1.16.5-4.15.0-integration.jar       
	chiselsandbits-1.0.63.jar                      
	geckolib-forge-1.16.5-3.0.106.jar

Mod up to date

• Before submitting this issue I updated to the newest version and reproduced it

Minecraft version

1.16.5

Modloader version

Forge

Logs

https://gist.github.com/ThommyaVV/2c47dd384f8ff6d9aadd8667ba8c34d0