The directory is not gone, it's currupted. Corruption like these happen from time to time with PFS2. I am sure you cannot delete the directory. You'll get the same error messages from the delete attempt. Run the diskvalid program to find the errors. With the fix option it will repair the partition at the expense of deleted files which might still have been accessible.
If diskvalid cannot repair the error, try the removedirentry program to remove the corrupted directory, then run diskvalid fix to free the deleted space.
