Yes, that’s an option I can consider (repurposing that ethernet cable for that) if this would happen more often.
I guess I just expected the DC side (MPPT, Lynx, Pylontech BMS, Cerbo DVCC) would continue to do their thing. Much like the first picture in this thread where PV seems to keep charging batteries: Cerbo GX Venus v3.5 - losing grid meter - #2 by Xtopher