Is this the case with all versions of the Argon One cases do you know? They switched from Micro-HDMI to Fullsize-HDMI on their Pi 4B cases - do both have issues with lack of Hotplug, SDA and SCL pass-through on their extenders?
Ah, didn't know they now have fullsize HDMI, so there's some hope the situation improved.
So far I only know about issues with their old micro HDMI versions. They had quite some QA / production issues with the board (can't say how high the actual failure rate was, though):
- pin 19 (HPD) shorted to the GND/shield pad next to it, so hotplug detect didn't work
- cold joints / no connection on some HDMI pins/pads
So basically issues in their (reflow?) soldering process which OFC is more critical with the small pitch of micro HDMI connectors, compared to full size ones.
Issues with soldering are quite common, it's very rare to hit 100% yield rate, but usually QA (automatic optical and electrical inspection systems) should have caught those.
so long,
Hias