You ever land a job that doesn't have as much work as they claimed it did?

I feel like my current job and the last one that I had previously at another Fortune 500 company, I was told they really need someone, I fit the skill set perfectly, they really needed help, drowning in work... And for like the first six to nine months when you are learning and starting out and really helping them catch up on their backlog and stuff, it feels like you're being productive... Then the amount of work you have to do just completely drops off and you go down to having like, 30-hour weeks with lots of meetings, and at least 10 hours of not doing anything because there's really not that much to do Then I go into "sweeping the floors" phase. Basically looking for random stuff to do when there isn't really much at all. Like, there's just nothing to do. It's project based so waiting on another project or waiting on deliverables, business as usual stuff, not reinventing the wheel. I've even volunteered for stuff and been told there's not really much. Not to mention the whole "we desperately need AI to help us with productivity" like umm... I don't think we really need it considering that we don't have enough work to go around as it is