...while it was working on the 2.79 and older. Is it for all Radeon cards, even 2019 (580) ? Do you want to lose all your Mac users? Are they a so insignifiant part?
Operating system: MacOs 10.14.5
Graphics card: Radeon Pro 575
Short description of error
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).