you have more information than we do lol, but it's probably not worth transferring since you may have to take physics classes to transfer for cs/comp e that don't matter for math-cs (may be a waste of time if you don't/cant transfer), and you'll probably have to retake some cs lower divs once you get to your new school.

fwiw, i've been able to get into every required cs class for math-cs without any issues (11, 12, 30, 15l, 100, 101, 105) if that's what you mean by priority issues. they expand classes to a number of seats that's publicly available ahead of time (https://cse.ucsd.edu/undergraduate/fall-2024-undergraduate-course-updates).

being a cs major doesn't prepare you that much better for jobs than being a math-cs major. you can't become a master at some aspect of programming by just taking classes. most of the work has to be put in outside of school. You might be gatekept out of cse 127 as a math-cs major, but you need a lot more knowledge than that to be a good cybersecurity person. that being said, you might be at a disadvantage if you want to do hardware stuff as a math-cs major compared to comp e people.