Ok now i finally found that zoom bug i couldn't replicate.
I still don't know what causes this. Some clips just don't keep the zoom level.
Project file:
https://www.dropbox.com/s/h6cp9ui8z2...BUG_3.RPP?dl=0
Midi settings:
https://prnt.sc/jd9krz
Open the first item called "OK"
Set any zoom setting
Close and reopen the midi editor - it should keep that zoom level in all subsequent editors right?
Now close the editor and open the "NOT OK" clip.
The zoom is much further out.
If you glue that item, it will work as it should.
Worth mentioning, the original content of that midi clip was opened from external MIDI files, and was put into multiple takes. I have attached the original clip with the takes if it helps.