So it is my understanding that the ClockworkPi (DevTerm specific stuff) for A04 motherboard on Armbian haven’t been integrated into the Armbian trunk yet. For A06 (and I guess Raspberry Pi CM3+4) it has however: Armbian 22.05 has been released!
Conclusion then, that an armbian upgrade can/will break the DevTerm A04 hardware support, and that’s why I haven’t re-enabled it. I plan to either start with a new OS image (which has the Clockwork Pi patches on top of whatever Armbian is in there) at some point, or move to RPI CM4, which should circumvent this problem.