Reproducer:

• Have a project with a baseline and reportUnmatchedIgnoredErrors=true
• Move around some files that are contained in the baseline: PHPStan should now fail with something along the lines of Path "/path/to/moved-file.php" is neither a directory, nor a file path, nor a fnmatch pattern. (expected)
• Generate the baseline again with --generate-baseline

I would expect PHPStan to be able to update the baseline directly. Instead, currently it fails. So in order to generate the baseline again I need to remove those entries from the baseline first.

I have hit this case in infection, if it's not a standard behaviour let me know and I'll work on providing a better reproducer.