Never ridden a BMW, so this is just speculative and may not apply to you, but on my KTM a dragging clutch can be a sign of a clogged oil jet (little bolt with a hole that squirts oil onto the clutch pushrod) and also a failing clutch slave cylinder.
Like I say, I'm just guessing and I dont have a clue about BMW's, but it may be worth investigating.
TBH though, a little clutch drag aint nothing to be worried about.
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