When processing send in smart alerts, if the process takes more than a few seconds, a modal appears to indicate that the processing is happening, and gives the user the choice to not send by clicking the x in the corner or the don't send button.
Clicking anywhere on the semi-transparent overlay behind the modal also closes the modal and cancels send as though the "don't send" button had been clicked.
The same thing happens if the user presses "space", "enter" or "escape".
Clicking off overlays to dismiss should only happen if the overlay is informational, and dismissing does not affect workflow.
This is an issue because if the user happens to click or be typing somewhere on the screen as the prompt appears, it will immediately dismiss with no indication other than the send button becoming clickable again (a slight colour change).
This was raised as a bug here https://github.com/OfficeDev/office-js/issues/6327#issuecomment-3651038782 but was deemed to be working as intended, and I was instructed to raise it here instead.