Cannot lock or group child nodes of ParallaxBackground

[ghost]

Tested versions

v4.2.1.stable.official [b09f793]

System information

Godot v4.2.1.stable - KDE neon 5.27 22.04 - X11 - GLES3 (Compatibility)

Issue description

Normally one can click on a node with children in the Scene panel of the editor and then click the Lock or Group buttons to prevent selecting or moving those children independently:

However this isn't the case for the ParallaxBackground node... Clicking those buttons (which aren't disabled, so should be usable) doesn't do anything - child nodes (e.g. Sprite2D's) are still selectable and movable. I do notice however that the buttons are instead labelled Unlock and Ungroup...

If this is by design, I suggest making these buttons disabled for ParallaxBackground nodes to avoid confusion.

Steps to reproduce

1. Open the 'parallax_test.zip' MRP below
2. Click and drag one of the icons in the editor to show they're not locked/grouped
3. Select the ParallaxBackground node in the Scene panel, then click on the Lock/Unlock and Group/Ungroup buttons
4. Notice the button icons don't change
5. Click and drag one of the icons in the editor to show they're still not locked/grouped

Minimal reproduction project (MRP)

parallax_test.zip