With los recovery you need to reboot to recovery after the ROM install. Then you should be able to install gapps and magisk.yeah i figured twrp was switching slots. its probably because thats what ota's do. twrp needs an option to switch back after flashing but thats not going to happen because its not being developed. my downloads are fine, but when i try to flash something with sideload in los recovery, it says its not signed which makes sense and it lets me hit "yes install anyway", but then it just reboots recovery. maybe if i could just turn off signature validation before hand in los recovery, it would just work, i dont know. but you cant do that in los recovery though.