Inspecting a material in `Mobile` renderer disables all lightmaps in open scene

[MajorMcDoom]

Tested versions

Reproducible in 4.4.1.stable, 4.5.dev3

System information

Godot v4.5.dev3 - Windows 11 (build 22631) - Multi-window, 1 monitor - Vulkan (Mobile) - dedicated NVIDIA GeForce GTX 1660 SUPER (NVIDIA; 32.0.15.6636) - Intel(R) Core(TM) i7-10700F CPU @ 2.90GHz (16 threads)

Issue description

If you are using the Mobile renderer, and you inspect a material (whether through its own resource file, or embedded in another parent node/resource), any lightmaps you have in your scene are temporarily disabled. This makes it impossible to edit the material in the context of the scene.

Steps to reproduce

• Open attached project/scene
• Do one of the following:
  • Click on any of the geometry nodes in the scene and expand its Surface Material Override, OR
  • Open up test.material to inspect it
• Note that the lightmap in the scene disappears, but returns as soon as you inspecting the material

Minimal reproduction project (MRP)

bug-report.zip

[SpockBauru]

Tested all way back to 4.0.0, the issue still happens there.

This bug is really annoying, if anyone makes a PR and needs testing, please tag me ^-^