Continuous animation of Polygon2D points no longer works. (Animation Player)

[komdog]

Godot version

v4.2 beta2 [f8818f8]

System information

Windows 11 - v4.2.beta2.official - Compatibility

Issue description

In version 4.2 dev3, I could animate the points of a Polygon 2D in the animation player using the continuous update mode. This no longer works the way it used to. The polygon will remain on the initial frame, no matter how many keyframes are added. I've noticed that when setting the update mode to discrete, the points will still animate but return to the initial shape if no keyframes are present at the current spot in the timeline.

Steps to reproduce

1. Create a Polygon2D and an Animation player.
2. Animate two keyframes with different Polygon2D points.
3. Set the animation update mode to continuous.
4. See Issue.

Minimal reproduction project

polygon_2d_animation_player_issue.zip

[vyshliy]

Can confirm issue. Also discovered this when animating a polygon, but the same thing happens when trying to animate any PackedVector2Array.

In version 4.1.1 the animation was played in the continuous mode, but only with linear interpolation. Cubic was broken completely: it made polygon invisible and removed array data. Similar was mentioned here

[aXu-AP]

I can confirm the regression happened between 4.2 dev5 and 4.2 dev6. So #80813 seems to be most plausible option? CC @TokageItLab

[TokageItLab]

May be fixed by godotengine/godot-proposals#8085 with salvaging #66771.