When I plug in power for my laptop, my screen dims to the lowest brightness possible, which is a bit weird and unwanted.
I couldn't find an option in the settings to change that behaviour, so I'm asking here if anyone knows how I can fix it.
I'm not sure about this one, when you open Settings -> Power, do you see different values when you are running on battery and when plugged in? It could also be hardware related, what's your laptop's brand and model?
Do you recall if the battery was quite low when you plugged it into the charger?
As you could not replicate it, it really sounds like the power drain exceeded what the power supply could supply while also charging the battery up at the same time.