This has now been resolved:
Elite Onefinity Masso Firmware update 5.05 released (10/21/23).
Masso has released firmware update 5.05 to the general public. This release has many updates and bug fixes. It does include one safety fix that is important to all Onefinity Users.
This update resolves the bug in 5.03 probing that could find the spindle to turn on during probing. This could result in harm to the probe, bit, or user. If your machine is on 5.03 firmware, we recommend updating to the new 5.05 firmware immediately to avoid this probing issue.
More here:
https://forum.onefinitycnc.com/…/elite-onefinity…/22899