Is there a way to temporarily disable the jailbreak, then open/use the banking app, then re-enable jailbreak? Even if it required a reboot I'd be okay with it.
I haven't used it myself, but two very similar kernel-level jailbreak detection bypasses were just released for unc0ver 13.x, FlyJB and KernBypass: https://github.com/akusio/KernBypass-Public
A couple of my banking apps detect my jailbreak but allow me to continue after hitting "Okay". The only app I ever wanted to use that refused to let me in was the Nintendo Switch Online app. Steam works fine. If you don't play games on your phone it isn't really a big deal imo.
One of those cases where a bug really is a feature