I was thinking the same, but I don't think it was let you efile 8915E yet. I wonder if it will move the number to the "F" once its final, if its ever final...
I find this quirk quite good as it can help you catch a return with a three year spread and is a reminder to either wait for the 8915-F or use the workaround solution.
I'm curious: does the 8915-E show Year = 2021, as if that is meant to be in the filing package? Because technically, a year 2021 of that form doesn't exist.
Does your software not bring the amount over? I'm not meaning to sound "smart", I'm just curious because some people say their software isn't bringing over 1/3 of the amount. Ours is, I feel that it just started today or maybe yesterday. But it is clearly putting it on 8915E. It shows at the bottom of the form, amount subject to tax in 2021.