When I went from multicellular to macroscopic all of my cells disappeared in the editor and i cant place them or advance forward and the game softlocks
If you have a screenshot or the game logs from when this happened I could confirm, but I think what you saw is this:
Which is a random engine issue where it just breaks loading a part of the game for no apparent reason, and we can’t do anything except wait for an engine bug fix (I’m not sure if this bug has been reported to the engine developers; it won’t get fixed ever if the engine developers don’t know about it).