Cannot copy from locked track

Hello folks,

I’m new to N5(.5) and am surprised by sth that I don’t remember from N4: When I try to alt+drag a clip from my “OMF” tracks, which I usually have locked to prevent moving things there, to my working tracks, I can no longer do this now as it won’t let me while the track is locked. This (new?) behaviour breaks my safety workflow - any ideas on how to solve this?
Could this be changed in a future fix? The copy+drag from the track doesn’t alter anything on the locked track, so why is it prohibited?