Deleting extra materials in blenderbim breaks when exporting/saving IFC
I am attempting to delete extra non assigned material from my IFC file:
It deletes and then exports but on re import to check, It doesn't actually delete the material
I had an error earlier but it seems to have gone and cant get it back, does anyone know what I'm missing here?
I've attached the IFC if anyone has an idea
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Ok I've realised it's the exact same problem as here:
https://community.osarch.org/discussion/comment/10947/#Comment_10947
and Dion is working on it:
https://github.com/IfcOpenShell/IfcOpenShell/commit/4184f2bf465f65167f3178ec610f931bf778bae2
Does anyone know how to delete the IFCstyle in that case?

I've attempted to unlink it and then delete but to no avail
I think, this way.
https://www.dropbox.com/s/egbmnq9zwavmvxx/2022-03-29_10-54-14_Blender_blender.mp4?dl=0
That works brilliantly!
Just saw @theoryshaw video. That's great