I think it may just be a UI error in the intermediate worksheet of the online version. Because even though it displays as "Not Started" on that page, the value I entered clearly saved and is there when I open it back up. Then I manually calculated the total rental property's profit/loss, and that seems to be correctly calculated when I look at the total results of the Schedule E being integrated into the rest of the tax return. So I think the underlying numbers are correct, but there's a UI bug preventing that one entry from being displayed.
