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Just stumbled on this incident as a matter of interest:-
Airbus A320-232, G-MIDW
That is interesting indeed. If this crew had a similar event, but reacted differently (i.e. warning goes but display shows correct parameters so lets disregard the 02 masks for now and look into it …)
It may explain the creeping Hypoxia.
Note that FCOM/ABN for EXCESS CABIN ALT states:
"Rely on the CAB
PR EXCESS CAB ALT warning even if not confirmed on the CAB PRESS SD page. The warning can be triggered by a cabin pressure sensor different from the one used to control the pressure and display the cabin altitude on the SD".