This seems like a bug on the TurboTax end - can someone open an issue on the backend and have it looked it? It's a pretty critical bug since it's forcing users to partially paper file without ANY warning before the e-filing.
I was just hit with the same issue: everything seemed great until after e-filing, I get a prompt that I need to print Form 8453 and with it Form 8949 along with all the worksheets (Form 1099-B). I'm also including my Schedule D along with all the other related worksheets and broker statements for good measure. If there was a warning given or had I known about this before I e-filed, I would've done my utmost to mitigate this.
As it is, I need to make a post office trip to mail the documents. Completely avoidable if this bug didn't exist...go figure there's a year between software release cycles to iron these out and still there's an issue!
