[TRACKER] StateMachines/SubStateMachine is not working correctly

[TokageItLab]

Issue description

This is a tracker for problems with mainly nested StateMachines not behaving as expected.

May be solved by:

• Separate Sub(Nested)StateMachine and StateMachineGroup processes godot-proposals#6130

Tasks

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1. If parent StateMachine has Xfade, SubStateMachine is not properly initialized after end #68986
   bug confirmed topic:animation +3
2. AnimationTree ignores first frame of first child state when traveling from root to SubStateMachine #71562
   bug topic:animation +2
3. AnimationTree: travelling directly to a state inside a SubStateMachine doesn't work, even though the transition is valid. #62576
   bug topic:animation +2
4. AnimationTree: OneShot should reset StateMachine internal state upon its completion #69063
   enhancement topic:animation +2
5. Renaming nested StateMachine has unexpected behavior (rename to "null") and sometimes crashes #58822
   bug confirmed crash topic:animation topic:editor +5
6. [4.0] Animation Tree: state machine multi-transition delete confirmation popup says "OK" instead of "Cancel" #73643
   bug topic:animation +2
   
7. [4.0] AnimationTree transition to sub-state machine node is erratic, e.g. repeats last animation at new animation speed #73648
   bug topic:animation +2
   
8. Multiple AnimationTrees don't restart secondary animations on StateMachine transition #57223
   bug topic:animation +2
9. [3.2.4-rc1] AnimationTree: Blending or Adding animations out of a State Machine node doesn't work properly #45635
   bug confirmed topic:animation topic:core +4
10. Cannot blend the output of two animation state machines outputting the same animation using filter tracks #51408
    bug topic:animation +2
11. AnimationTree: transition with xfade from a state machine start with wrong animation. #74752
    bug topic:animation +2

If there is anything else, please comment.

[TokageItLab]

Completed!