That’s just how microwave popcorn is. I just put the microwave on for 9 min or whatever large number is easy to start and wait until the popping slows to a second or two between pops. There’s no way to have a perfect amount of time for all brands and packages of popcorn. Not to mention shrink-flation has made the time need to be shorter and different altitude changes how long it takes among other things. I have heard that some microwaves actually have been made with a microphone to listen for the time between pops, but I’ve never used one. But since they can’t be adjusted for your preferences, I’ve heard they usually burn it anyway. It’s always better to have it a little under popped than a little burnt IMHO. Once you do it a few times for a particular brand you’ll find the right amount of time if you need to walk away.
Much like book bans in school libraries that have moved to city libraries and all the other bans that started in schools, this will soon move from bans on children getting healthcare, to bans on adults getting healthcare once they use the “save the children” rhetoric to make their followers comfortable with the prejudices in general.