Syncing designs from previous forza titles

i really enjoy making vinyls in motorsport 6 for my tag cars and for a while i could make them in 6 and import them into horizon 4. i dont remember what update it was, but as of 3 or 4 months ago whenever i go to import from fm6 into fh4 my horizon design catalog shows my horizon 4 designs under every tab. i talked to another player and they said theirs was doing the same thing. i know i seem like a FOOL for preferring to use fm6 over fh4 for making designs but i have so many motorsport designs and vinyl groups that i want to import into horizon. its honestly killing the game for me and i dont really play it anymore because of this issue. ive been waiting for a patch but i havent seen any people with this issue on here so i figured it was a rare bug or something.
is anyone else having this issue? or could it be a game corruption?

ive had motorsport on disk and then later got it with xbox gold for free and horizon i had first on game pass and now have the disk. all of my save data for both games are saved onto one 2tb hard drive. i have tried to import from the fm6 tab on fh4 thinking maybe it was a picture bug but it really imports a design from fh4 into fh4

It’s a known issue with Forza Support and there have been many threads about it in various parts of the forums - click here for a list of some of them.