[2021] I have a broken asset, can anyone specify which one it is?

The assets are likely missing a network or mod to function. If you use the Loading Screen Mod that should be able to give you a link to what is specifically missing.

Alternately you can check the workshop page of the broken assets to make sure you have everything that's required. The number you see is the SteamID, which you can add to this url to find the items on Steam: https://steamcommunity.com/sharedfiles/filedetails/?id=

For example, the first three are this item: https://steamcommunity.com/sharedfiles/filedetails/?id=2350676479

And the last one is this one: https://steamcommunity.com/sharedfiles/filedetails/?id=626607549