Update 2:
Since this update, charging has not been behaving well.
Whilst the machine is booted, I get warnings from the OS:
This is via a Dock.
I’ve also tried directly plugging in a power supply, and the port LED lights up - but doesn’t seem to start charging.
Update 3:
Charge accepted from at least Left Top USBC port via official adapter after a “Disconnect Battery” from BIOS.
Pretty sure this won’t get me 100% out-of-the-woods, though.
I’ve opened a ticket with Framework support to see if they can help me get this charge issue resolve and/or help me get this Retimer update applied.