MacBook Pro M1 not charging, showing implausible Instant Amperage

My MacBook Pro (M1) is showing “Battery Not Charging” even though it is connected to the original Apple 67W USB-C charger (which is correctly detected by macOS). This occurs intermittently. Restarting the computer temporarily fixes it, but the problem returns after a few hours. Battery details: - Battery cycle count: 433 - Battery health: Normal (85%) - State of charge: ~25% when problem occurs • Temperature: Normal (~30 °C) I know enough to be able to check battery details via terminal

pmset -g batt
Now drawing from 'AC Power'
 -InternalBattery-0 (id=22610019) 24%; AC attached; not charging present: true

The most concerning detail is that the InstantAmperage is clearly invalid:

ioreg -r -n AppleSmartBattery -w0 | grep -E "InstantAmperage"

I get

InstantAmperage = 18446744073709549095

I suspect a wraparound 64-bit overflow. The fact that restarting temporarily restores normal behaviour also suggests this is not a charger or OS-level issue. I’m trying to confirm: 1. Is this a battery controller failure? 2. Is there any further diagnostic I should run to be certain? 3. Would battery replacement resolve this, or could it be a logic board issue?