[2021] "failed to saved enabled status for mods in playset"

Please try the following:

- delete the folder Documents/Paradox Interactive/Stellaris/mod/
- delete the file Documents/Paradox Interactive/Stellaris/mods_registry.json (if present)
- delete the file Documents/Paradox Interactive/Stellaris/launcher-v2.sqlite (if present)

- run the game up and see if those mods are now available to you.

I hope that does it for you!