ChordPro Buddy 1.2.0 has been rejected by Apple, new CPB version 1.2.1 with sandboxing delivered to Apple for new review

Today the new ChordPro Buddy release 1.2.0 was rejected by Apple because they claimed, that it was no bug fix release (which is perfectly true) and I have to implement Sandboxing. So I did today and the new version 1.2.1 with enabled security entitlements and sandboxing is already uploaded to the Apple review team.
What I’ve learned for the future is, that I’ll try to break the upgrades into smaller peaces and to release more often instead of one major upgrade after a more or less long time...