My 2020 13" MacBook Pro (the last Intel model) is behaving badly at times. Normally it lives on my desk and is plugged in. Sometimes I use it as a laptop - unplugged. If I run the battery down to about 60-70% then shut it down and go to bed, next morning it starts up normally then goes blank immediately after booting up. It then occasionally shows the red "charge me’ battery symbol. If you plug it in and restart it the battery shows 70%.
Do other people see this behaviour? Is it a symptom of a failing battery? Any advice?