I was able to get this installed now on my 12 Pro with the iOS 14.3 jailbreak. A fun part is that I was able to then install a tweak called CarPlayEnable and now I can have CellularInfo showing up on my car's entertainment system to check out new LTE bands.
Still wish I knew enough to work on getting the actual signal levels to display, but I was able to get another tweak called SignaldBm installed to replace the signal bars with the RSRP level in the status bar, so that works for now.
Waze was running during the issues. I let it go for two days before I rebooted. Once done, no more issues. SCP location service at high accuracy, update interval 4000. So far so good, it was the first reboot after Android 11 update...I’m not that technical, maybe the phone was stuck on stupid and had to reset.