AnimationPlayerEditor doesn't preview the Animation when seeking Animation Playback Tracks

[arose26]

Tested versions

• Reproducible in 4.2 stable.
• Same error doesn't occur in 4.1.3 (previews work as they should)

System information

Windows 11 - Godot 4.2 stable

Issue description

When I create a regular animation of any property it will playback in the editor fine as I move the play head. However, if I add these individual animations as Animation Playback Tracks to a new AnimationPlayer, moving the head no longer plays previews.
This is inconvenient as I wish to sync different object animations and have to do it blind.

Steps to reproduce

Create a regular animation, then add the entire Animation Player to a new animation player as 'Animation Playback Track'. Try to move playhead. The preview of the animation will not play.

Minimal reproduction project (MRP)

N/A

[Helpsypoo]

The original submission covers it, but I made this gif before realizing the issue was reported already, so adding it in case it's helpful. The gif shows the scrubbing working on 4.0.2 but not 4.2.