At the risk of wasting more of your time, have you tried removing the internal hub and disassembling it? It’s remotely possible there’s a small piece of filament stuck in it causing the sensors to think there’s still filament loaded in the AMS past the hub towards the printer. This would affect all slots if so. This link shows how to do it if you haven’t yet. I’ve never had to do this so can’t offer much help, myself I’d be inclined to try it to confirm it’s clear while you wait for BL to help.
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Me too, very irritating!
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I’ll give it a try. Thanks for the tip!