Selecting unused materials not working correctly?

I’m trying to delete unused materials, but when trying to delete after selecting via the dialog, it tells me several of them are still in use:

Any thoughts? Bug?

Hi Andrew - are there blocks in the file?

-Pascal

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Hey Pascal!
Not according to BlockManager.

Hi Andrew - can you please send the file to tech@mcneel.com, with a link back here in your comments?

-Pascal

Done.

Hi Andrew - yeah, there is a bug here someplace - the file initially opens with ten materials, of which three are un-used - all of these can be deleted here.

On reverting the file however, this all gets out of whack - in short, I see correct and buggy behavior, both… I’ll see if I can figure out what causes the latter. Thanks for the example.

@Andrew_Turner one thing that comes to mind is that some objects have per face materials - I need to see how that might affect the materials panel, I can see that it might well do something.

-Pascal

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