This popup was recently introduced in PR-2174.
I don't know exactly why, but voyager prompting me that I'm about to lose my progress was sort of strange to me in the context of scrolling on lemmy.
I understand why someone wants such a feature, but IMO this should be turned off by default and available as an option.
Sync seems to? Unless im misunderstanding here. But I can close it come back like 6 hours later and it will still be where I was. Obviously if I do any additional scrolling since the order of the feed has changed it won't be able to give me the feed as it was but it does at least remember the last page of things I was looking at