Wake up at 0530, get ready for work, start driving to work, think to check my work schedule app...

Have you asked them to do that? Perhaps they simply haven't thought of it.

I would be looking for somewhere else to work.
They are showing total disrespect

your job has weird management, never heard of such things.

That sucks. You should be on a set schedule a week in advance, that can't be changed.

Well hell 😕😕

I actually quit a job like this back in the 90's, they were constantly changing my schedule without notifying me then writing me up, I would have a day off, someone would call in sick, I'd get a call why wasn't I at work and get a write up, show up at work on a scheduled day and be told I'm working swing that day, not day as scheduled. It was through a temp agency and the turnover was extremely high.

There should a law where they have to notify you

24 hours notice should be mandatory, except where emergency cover is needed.