When I upgraded a project containing .glb and .blend assets from 4.2-beta4 to 4.2-beta5, I got multiple occurrences of this warning message:
drivers/gles3/rasterizer_scene_gles3.cpp:265 - Attempting to use a shader that requires tangents with a mesh that doesn't contain tangents. Ensure that meshes are imported with the 'ensure_tangents' option. If creating your own meshes, add an ARRAY_TANGENT array (when using ArrayMesh) or call generate_tangents() (when using SurfaceTool). (User)
I tried deleting the .godot folder and all the .import files, and re-importing all the meshes, but I still get the messages. The 'ensure_tangents' option is checked.
There are also warning messages like this:
W 0:00:00:0435 load: res://section_indicator.tscn:3 - ext_resource, invalid UID: uid://d4d3q5ox452ut - using text path instead: res://section_indicator.glb <C++ Source> scene/resources/resource_format_text.cpp:448 @ load()
The project runs correctly, without any errors.