fallow canopy
The internal laptop is very likely still causing issues, it's recommended that you either unplug it if possible or buy a new one.
The issue here is that most modern laptop kb's are an all-in-one with the power button, kb, touchpad and laptop shell fused together.
you can attempt this: https://rtech.support/factoids/cleanboot/
its not a solution though, just a bandaid if even that
3rd party services
the .gif shows everything you need to do
Doubt, I'm fairly sure this is purely a hardware issue.
shrug broken internal laptop kb's do funky stuff and can work when connected to a working ext. keyboard
slim meadow
sharpkeys resolved the issue