1. Edit any release
2. Go to Tracklists tab
3. Edit track 1’s artist credit
4. Add any artist
5. Press Next
6. Press previous (here you don’t see your new artist credit on track 1 any more)
7. Press next (here you see your new track 1 artist credit on track 2)
If you use the Done button each time it’s OK but otherwise it’s now completely crazy.