No errors, nothing seemingly wrong -- yet nothing happens

[Scryptings (Con Scrypt)]

just a couple of proof to back me up :
https://developer.roblox.com/en-us/api-reference/function/Humanoid/LoadAnimation

Deprecating LoadAnimation on Humanoid and AnimationController

Some of you have already noticed that Humanoid:LoadAnimation, AnimationController:LoadAnimation, and all the other animation related APIs on Humanoid and AnimationController were marked deprecated. This wasn’t an accident! Of course these deprecated methods are not going away; we can only rarely remove deprecated functionality without breaking games. However, we strongly discourage their use. Using these deprecated methods as intended can easily lead to broken animation replication. It’s a tra…