Can you try to confirm this, Gabriel? If yes, please fix and also write a functional test to make sure it never happens again, thank you. ^^

The problem is that a "beforeunload" is registered on that page to avoid exiting the page without saving.

That doesn't work in most cases (because many things are loaded by ajax, so you lose changes anyway), and at the same time the message is displayed.

We can make an "off" to the event, so that the message is not shown when saving.
But the best would be to define if the functionality must be present or not. If you have to have it, you have to make sure that it works also when browsing PJAX (difficult). If it's not needed, it's better to directly remove the "beforeunload" handler.

Yeah, good point, maybe just delete that prompt all together for now.

https://github.com/LimeSurvey/LimeSurvey/pull/2559

Fix committed to master branch: http://bugs.limesurvey.org/plugin.php?page=Source/view&id=33701

Fixed in Release 5.3.30+220808