Let’s try my version then
- Insert into internal memory boot.img and magisk zip
- Flash both boot and recovery using twrp.img using flashtool
- Turn on your watch, then install img>choose boot. Img.
- Install zip>choose magisk zip
- Reboot system
This way is more useful if you doesn’t have patched boot.img since boot into system normally will overwrite twrp with stock recovery.