Yes the old stages (PCM16 & previous) are not directly compatible. For gameplay reasons, we have added new parameters in the stage files (.cds) that are used by the game engine.
There are no stages like that in the original release version but when you use a pack from Steam Workshop, it's possible that the creator did not pay attention to that

If a stage from an old PCM has been put in a pack without a proper re-export (= with the PCM 2017 editor) then this problem appears 100% of the time.