Activating tempo track changes midi duration in C11.0.10rc1 and N11

(de)activating tempo track changes midi duration e.g. from 01.0.0 to back and back in correlation to the tempo change (here e.g. from 120 to 176 bpm), made after having edited parts in the score editor. Should this make any sense or did I miss or forgot any settings anywhere, causing this effect? I can’t imagine any logical reason for this behavior.

Sounds like those midi tracks were set to linear time base

ups, yes, will check it. many thanks