OneShot animation in AnimationBlendTree couldn't get back to an original animation when key update mode is discrete

[takanan]

Tested versions

• 4.2.1.stable and 4.2.2.stable

System information

Godot v4.2.2.stable - Arch Linux #1 SMP PREEMPT_DYNAMIC Wed, 17 Apr 2024 15:20:28 +0000 - X11 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 2060 (nvidia; 550.67) - Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz (8 Threads)

Issue description

• When OneShot animation ends, it fails to fallback to an original animation

a.mp4

• This doesn't happen when key update mode is set to continuous

b.mp4

Steps to reproduce

• create two animations with discrete keyframes
• create AnimationTree with BlendTree root
• create OneShot node and connect two animations
• fire it

Minimal reproduction project (MRP)

sample.zip

[TokageItLab]

Already fixed in 4.3 by CallbackModeDescrete property.