[Fisneaky]

I can recall making a mission in FMB+ using runway plates. It would run in un-modded 4.08m and load in un-modded FMB but not save.

Whether there's a parallel here , or a workaround* , I don't know.

* create the map without the Zuti mod and copy the runway plate details from .mis file with notepad.
(I've not tried this - just a suggestion)