I do think that's the case. A lot of them are Gen Z.
At my wife's company, one of the previous MAs was a Gen Z girl who exemplified all this behavior. She was also a real Type A personality and got herself in hot(ish) water a few times by firing off unwise emails to upper management about stuff that was really none of her business. She'd regret it, and then boo-hoo in my wife's office (while she's trying to get actual work done) about how she really needed that job, she couldn't afford to lose another one, because apparently she'd already been let go by two similar companies for similar behavior. And all that on top of the fact that she knew she called in a bunch of days (usually on Mondays).
In true Dilbert fashion, she was promoted to management. She is over my wife's clinic and several in the Houston area. While she has no authority over any of the medical decisions, she is technically my wife and the other providers' boss, as far as operations, scheduling, requests for time off, etc.
My wife does note that the girl actually seems to thrive since being promoted. She is allowed to work from home about as often as she wants in that role, and my wife says that while she's absolutely no help in coming in to staff the place to have adequate personnel so that providers can sometimes leave early if they are done with their patient load, that she's pretty on top of the day-to-day stuff. Apparently she just wasn't cut out to be a peon. She needed to be able to boss people around.
My wife is cool with that, and doesn't really care. Mostly she's just happy that they don't count on her for actual MA work anymore.
Me, I have a problem in principle with giving somebody a larger role (and paycheck) who couldn't be trusted in a lesser role.