The "on_top" parameter of EditorSpatialGizmoPlugin.create_material has no effect

[Zylann]

Godot 3.2.3
Windows 10 64 bits
OpenGL ES 3.0 Renderer: GeForce GTX 1060 6GB/PCIe/SSE2

I'm making a plugin where I show a custom wireframe gizmo with EditorSpatialGizmoPlugin. I need it to be shown on top, so I set the on_top parameter to true in create_material. However it does not have any effect.

With wireframe mode turned on, you can see where the gizmo is supposed to be:

MRP:
GizmoOnTop.zip
Check the plugin is enabled in ProjectSettings, open main.tscn, select the MeshInstance.

[stevenjt]

I hit this same bug when working on a custom gizmo. I've linked a PR with a fix that worked for me.

Since the MRP was for Godot 3.x I updated it to 4.3 (it still opens in 4.2.1 stable which I've used to compare it with my custom build):
GizmoOnTop_4_3.zip

With the linked PR the circle renders over the geometry when the gizmo is being used as expected: