Backporting Workspaces

i used to be able to simply open an older version of mcreator and open a workspace that was opened on an older version of mcreator (if the mod was more stable on an older version of minecraft or if i was backporting it)

but now thats no longer possible.

is there any other way to backport (or downgrade) a workspace?

and probably tell me why i can no longer open workspaces loaded in the newer versions cause i've been out of the loop for a while