The "puzzling results with no correct behavior" are:
- the fastboot boot command works with the OEM boot.img file
- the same command fails when using it with Magisk modified boot images
- the kind of failure I'm getting depends on which variant of Magisk I'm using
Additionally, I have not been able to get the device to boot into EDL mode using the "adb reboot edl", the device simply reboots. Do you have any ideas why this may be occurring?