We are pleased to announce SuperCollider 3.12.2! You can download it here: https://github.com/supercollider/supercollider/releases/tag/Version-3.12.2
This version reverses changes made to MIDI implementation on macOS introduced in 3.12.0, which turned out to introduce other issues with MIDI.
For the list of previous changes, see CHANGELOG.md.
Marcin & Josh