I wanna add on my experiences to this - it’s not just BannedByAndroid having issues with this.
For ALC, I deleted all the entries and reimported, to make sure I had current versions of the cars. Around a third of the field failed to import - including one car on a mod body I knew I had, which was complaining about not having the body. Many of these were cars I had just deleted; by all logic, they should’ve worked.
I reinstalled the game, nothing changed. I unsubscribed from everything in Delta’s collection and resubscribed, nothing changed. I went to sleep and turned on the game the next day, everything works.