DebugPhysicsShapes not rendering in layers other than group0+ flickering

[NicusorN5]

Release Type: Official Release

Version: 4.2.0.2122

Platform(s): Windows

Describe the bug
Debug physics wireframe shapes are not being rendered using DebugPhysicsShapes

To Reproduce
Steps to reproduce the behavior:

1. Add any type of entity (could be a entity with a existing shpere, for example)
2. Add a static collider with atleast 1 shape specified
3. Add a DebugPhysicsShapes script into the object or scene
4. Press Ctrl+Shift+P to show the colliders. There's nothing being shown.

Flickering:

1. Set the render group to 0
2. Start the project
3. Obvious rendering artifacts.

Expected behavior
Wireframe of the colliders being shown. Graphics not being broken when using group0.

Video
(www.youtube.com/watch?v=-voNclIgNAc)

Additional context
Found while investigating #395 .