[4.0] Editor lightmap softlock upon re-importing an OBJ

[YellowAfterlife]

Godot version

v4.0.alpha1.official [31a7ddb]

System information

Windows 10, Vulkan, 1660Ti

Issue description

In my attempts to attach a material to an OBJ exported from Qodot using the last tab of Import dialog I have managed to get the editor to reliably softlock upon opening the scene,

ERROR: Condition "!lm" is true. Returning: false
   at: lightmap_is_interior (servers/rendering/renderer_rd/renderer_storage_rd.cpp:7493)
ERROR: Condition "!lm" is true. Returning: AABB()
   at: lightmap_get_aabb (servers/rendering/renderer_rd/renderer_storage_rd.cpp:7499)
ERROR: Condition "!lm" is true. Returning: false
   at: lightmap_is_interior (servers/rendering/renderer_rd/renderer_storage_rd.cpp:7493)
ERROR: Condition "!lm" is true. Returning: AABB()
   at: lightmap_get_aabb (servers/rendering/renderer_rd/renderer_storage_rd.cpp:7499)

Steps to reproduce

Open the attached project, open TestScene

Minimal reproduction project

QodotTest4.zip

[Calinou]

@YellowAfterlife Can you reproduce this with the same OBJ mesh and import options in 3.4.2?

[YellowAfterlife]

@Calinou I'm not sure if this can be done in 3.4.2 since the advanced import menu (with ability to set materials per-mesh, which is how I achieved this problem) was introduced after that

[Setadokalo]

I'm encountering a similar error myself, using the tbloader plugin and a lightmap node. For me, the error occurs when I bake the lightmap, save and close the scene, and re-open it (the log begins flooding with Condition "!lm" is true errors), and if I close the project entirely and re-open it the editor freezes while opening, still flooding the log.

Attempting to recreate the error without a quake .map file loader (which qodot and tbloader are) by using a .glb version created through blender, I haven't encountered the error so far.