Hi - I posted about this last year as well and spent many hours on the phone with TurboTax support. Despite what the post above says, this is a persistent bug with TurboTax Online for certain kinds of rental expenses (especially if the expenses exceed the income on the property). TurboTax support does not file bug tickets, so I doubt TurboTax engineers are even aware of this issue, which means that I highly doubt it will be fixed for this year (or, frankly, ever). The only thing I can suggest is to use the downloadable/CD version of the software, which did not have the same bug. That worked for me last year, though I haven't tried it for 2021 taxes yet.
