All of my actors except a few suddenly say [Unloaded] and are hidden, what is this?

[anonymous_user_fb0c63221 (anonymous_user_fb0c6322)]

I came across to this now too, seemingly random assets remain unloaded. Pinning them works for me though, using 5.03.

Even as the pin works, I’d like to know why it’s doing this? What causes it, so I could avoid problems in the future.