Seems to be resolved. I was able to use both Focal with Kernel 5.10.60 as well as the Bullseye image with the same kernel.
There is a regression in recent versions preventing the Pine64 Sopine modules to run on the Clusterboard. It always required a network fix for getting the dhcp requests to come though, but since recent versions (newer than Armbian 20.11.3) this fix stopped working. Further details here: https://forum.pine64.org/showthread.php?tid=13866 Edit: this issue is resolved. Works with kernel 5.10.60 right now.