Closing and Reopening the project

When I close and reopen the project components added to my BP_Player get removed, is there any fix for this?

That happens to me sometimes too - drives me mental.
I have a sneaking suspicion if I were to build my project outside of unreal and come back in - it might save but i’m yet to figure out the cause.

Have you seen the lecture on Live Coding? I suggest disabling it.