Weird behaviour when setting the rect size via code and anchors

[YeldhamDev]

Godot version:
master: 37aab45

Issue description:
I have an anchored control set fully to Below, but I also have a signal that manually changes the rect_size.x when its parent is resized. This makes the anchor be completely ignored.

Minimal reproduction project:
Example.zip

• I searched the existing GitHub issues for potential duplicates.

[KoBeWi]

@YeldhamDev Is this still valid in 3.2.4 beta2?
I checked the project, but not sure what is the issue.

[YeldhamDev]

If I remember correctly:
The problem is that if the bit of code in the script is uncommented, the y value of TextureRect stops being updated, even if it just overrides the x value.

And from testing right now, it seems that it still occurs.

[YeldhamDev]

Still happens in c2d55a4, the example has been updated.