[parcel]

(edit) delete all '.fi' files in temp folder, problem is gone. Thank you!

Actually I've seen that has been needed a few times with nightly builds.
They are cache files which I think can become invalid when a PR gets modified (as often happens when they are pulled into these builds before merging).

I wonder how much cost you'd suffer from deleting them on each boot? If it's negligible it might be worth doing this on each boot (or each update).

It's not much. The problem appears just two times. Deleting '.fi' files at updating is good idea.