I’m also having charging issue after upgrading the firmware using an Anker 336 (67W). It is a lot slower now, the keyboard display now says -0.42A at 8.41V and I pretty sure it was -1.7 or something like that (don’t remember the voltage). Also very weird, pulling the charging cable does not reset it to 0.000A but it just stays at whatever it was, like it’s charging of the air. Flipping the standby power switch does reset it to 0.000A but keyboard power off/on does not so the keyboard controller needs to be reset to figure out the power is gone.
Btw I’m also having other issues with power, see Battery voltage jumps, not sure if they are related although the random crashes described there predate the fw update.