GLB imported into Blender will break glb
Importing a OB GLB into Blender and exporting with or without modifications to the file will create a broken GLB. When you import this file back into Unity it has the paper icon instead of the object icon.
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I recently did some smaller adaptions of the OpenBrush .glb in Blender 3.5 and was able to import it to Unity with the OB SDK.
However, only the action of deleting mesh parts with Blender did not break the file. When making other changes (like changing the hierarchy or joinging objects together), the file was broken. My workaround is to use a default glb importer unitypackage to import the blender-exported glbs. It was necessary to set up a custom shader that reads the vertex color, but apart from that it worked fine.