I have 6 rigs, 3 rigs can not run under 5.9c:
1 x RX5700XT - ok
7 x Radeon VII + 1 x RX6700XT - ok
8 x RX5700XT - ok
4 x RT6700XT + 3 x RX5700XT - fail
9 x RX5700XT + 1 x RTX3060Ti - fail
2 x RX6700XT - fail

All rigs work well on 5.8c
So, I updated them back to 5.8c
https://disk.yandex.ru/i/bY4zGarVKqAqEg - snapshot