Not 100% sure a bug, but-

[awesomeplayer123]

There is a resource pack called "Fresh Animations" and it bugs the mob ragdoll animations

Killing any mob would just disappear and no animation would play if using "Fresh Animations" resource pack for Forge version 47.1.43. For some reason the spider still works as intended but any other mob (hostile or passive) would just disappear.

Minecraft Version: 1.20.1 Physics Mod Version: 3.0.9

[MrSteveOff]

Fresh Animations is not supported with ragdolls, As Haubna said.

[MrSteveOff]

Yes, it is a bug, But Haubna can't fix it, sorry

[awesomeplayer123]

Ah I understand, thank you for letting me know