AnimationTree: The Animations play at high speed

[LiveTrower]

Tested versions

• Reproducible in: master
• Not reproducible in: 4.7.beta4

System information

Linux Mint 22.3 - Godot [417cd33]

Issue description

2026-06-02_11.14.06.mp4

Steps to reproduce

Run the TPS DEMO project or another project that uses AnimationTree with animations that aren't 1.0 second long.

Minimal reproduction project (MRP)

N/A

[AThousandShips]

Could be a regression from:

• Make AnimationNodeAnimation's custom timeline processing logic compatible with AnimationMixer #119871

CC @chocola-mint @TokageItLab