Continuous line2d points animation does not work

[rt9391]

Godot version

4.2.beta1

System information

win11

Issue description

Continuous line2d points animation does not work

4.1.2.stable

(the end key frame is not the same as the first key frame)
4.2.beta1

Steps to reproduce

1.create a scene with line2d and animationPlayer
2.make some Continuous line2d points animation( move the points in the array )
3.the points do not change at all when the animation is set to Continuous

Minimal reproduction project

N/A

[TokageItLab]

Dupe of #73342

[TokageItLab]

However, as with #83166 (comment), this also has the meaning of bringing a latent bug to the surface, I will elevate the priority of the issue.