Tested versions

Reproducible in 4.4.1, 4.5

System information

Godot v4.5.stable - Windows 10 (build 19045) - Single-window, 1 monitor - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 3080 (NVIDIA; 32.0.15.8129) - AMD Ryzen 9 5950X 16-Core Processor (32 threads) - 63.91 GiB memory

Issue description

A OneShot that plays before a StateMachine inside a BlendTree will never allow the StateMachine to transition out of Start.

If I attempt to enter this state for the first time in-game,

with my OneShot armed for entry from crouch,

this is what happens:

oneshot.mp4

I get a T pose. If I then move slightly, and go from my crawling state to my prone state, with no "settle" oneshot inside prone, the StateMachine then starts working.

Steps to reproduce

Open MRP and run the game.

The OneShot plays a vertical movement, the StateMachine is looped horizontal movement.

All the MRP does is arm the OneShot, then wait 2 seconds and transition out of the root's StateMachine's Start into the BlendSpace. The nested StateMachine never triggers.

Minimal reproduction project (MRP)

StateMachineOneShotBug.zip