Multiple AnimationTrees don't restart secondary animations on StateMachine transition

[FreegleBarr]

Godot version

4.0.alpha [30701e3]/3.4.2.stable.official

System information

Ubuntu 20.04

Issue description

I'm not sure if this is relevant as I couldn't find anything official mentioning the use of multiple AnimationTrees coupled with multiple AnimationPlayers, so this could just not be supported.

When a scene has multiple animation players being controlled by multiple AnimationTrees, which share the same BlendTree and Playback, and the state transitions to another state that is not set to looping, the state will not reset properly upon completion, leading to it appearing to be stuck on the end frame when transitioning to it again. Only the Player associated with the first AnimationTree in the scene will be correctly reset.

I have not tested with different BlendTrees or Playbacks.

Edit: Upon further testing, it seems that all animations other than the first fail to reset in 2nd+ trees.

Steps to reproduce

• Create a scene with 2 or more animation players and animation trees.
• Create a StateMachine root AnimationNode in one AnimationTree, save it and load in every other AnimationTree.
• Save one playback and load in every Tree.
• Create one looping animation and one non-looping one in every player with the names Loop and Non-Loop. Preferably they should modify different attributes.
• Now add two States Loop and Non-Loop in the State Machine, and connect them both ways.
• Play both Loop and Non-Loop once. All your animations should play in sync.
• Now play them a second time. Loop should reset properly, but all but the first AnimationTree should be stuck in the end.
• If you change which AnimationTree comes first, the one that doesn't stay stuck will change to that as well.

Minimal reproduction project

Animation.zip