disappearing UK assets

[Lightrail]

Does anybody know the cause of why UK assets are disappearing when I load a save? When I load a save the assets show up as blocks (a grey cube), then the abandoned symbol appears, then the blocks disappear. Is this a mod causing the problem, or a bug in the game? It's really annoying because I lose a ton of population whenever I start a save with UK assets.

[sternenstaub70]

Assets which show up as grey blocks are nothing else than assets which are not installed.
Since non-installed assets are nonfunctional it's no surprise those get abandoned and disappear (it's because the prefab data which is needed to work is missing as well).

The question is indeed: if you have subscribed the uk region pack - then why do their assets disappear?
Could you please check your Player.log at %UserProfile%\AppData\LocalLow\Colossal Order\Cities Skylines II\
Maybe there is some information about the UK assets.

Also, when starting the game, *wait* until all mods & assets have loaded, don't interrupt the loading process. Otherwise you might experience similar results.
Only when *all* mods and packs have been loaded, load your savegame.