Developer section has disappeared inside Quest 2 Settings

Inside the Quest 2 (consumer edition) after update to software 35.0.0.140.341, the Developer section in Settings has suddenly disappeared. Seen from the Oculus app, the headset is still in developer mode. We have remote customers with same issue, and disabling/re-enabling developer mode is not an option for them.
In Settings, I currently have Guardian disabled, and the Guardian menu is grayed out, and telling me to go to the Developer section of cause. So I know the headset is still in Developer mode.
But where has it gone ?