I haven't tested OrageFox but I am able to flash via TWRP.
ADB Sideload method works too, just don't use the recovery bundled with the ROM. It will give you an error regarding signature verification. You can boot PE 10 recovery or crdroid 10 recovery instead.
Fastboot method posted in the OP works too.
It does work but it is flaky.
Some apps don't show the pressed state glow but if you use a solid cyan icon & increase the brightness it works fine.
I am not sure exactly what's going wrong but it definitely seems to be some incompatibility with fod.increen 1.1 that RR uses.
LineageOS does not have any issues. In fact, fod 1.1 changes were reverted in LinageOS and are no longer present on the device trees.
New build with updated security patches is uploaded here: https://github.com/DroidFreak32/OTA...q/RROS-Q-8.6.9-20210902-avicii-Unofficial.zip