I can assure you here that it works on some drives but not others because the boot chain on Apple Silicon Macs is written from scratch, not using UEFI.
Bugs are being worked out slowly, and there's no reason to assume bad intentions here. (I have an Apple M1 MacBook Air, and it boots from a Samsung T7 external SSD just fine)
Bugs are being worked out slowly, and there's no reason to assume bad intentions here. (I have an Apple M1 MacBook Air, and it boots from a Samsung T7 external SSD just fine)