Markers placed at wrong spots

Scoring a film, using flows for different scenes. In each flow I set the desired timecode-start, and this has been working flawlessly. Suddenly though, and for no appearant reason, Dorico won´t place a marker added during playback to the right spot; the “valid range” in the Marker-dialogue is not referring to the range from which the current flow starts. See screenshot

Hm, now it suddenly works correctly again. I placed a marker using the sidebar and entered a value. Somehow that reset the valid range.

I will leave this post here, in case this is a known bug?