I’ve encountered this situation a few times already (in only a month of using BitWarden):
I’m in the midst of creating or editing an item, and I pause to do something else for a few minutes. When I come back to BW, it has automatically logged me out as it should per my settings. However, when I log back in, any changes that I was in the midst of making are gone because they were not saved prior to the log out.
So the feature I’d like to see is for BW to automatically save any items that were open for editing, prior to logging out at my set time out.