My apologies for the late response. I was looking into this yesterday and I’ve been investigating more today.
I found a potential solution on something called “PlayStations.repair”, but I can’t confirm the autheticity of this website myself. They suggest rebuilding the Database and I’ll post the solution here:
One theory on a different website suggested that the size of the file the console is trying to save is too large (over 3mb seems to be the limit). I don’t know how large the file you’re trying to save is, but this seems to be the most common issue. It appears to mostly be affecting games developed in the Unreal Engine, like MYZ, so it could be something related to the engine itself.
I’ve forwarded this to the dev team.