I had the same issue, where the distribution showed up on my 1099-DIV in Box 9. I received a similar message that it would handle it later, but went through the rest of the filing process and it didn't come up again. I was able to back track and enter it manually as a capital gain. I don't think you need a 1099-B to enter a capital gain. As long as you know the distribution amount (Box 9), cost basis and the respective dates, then you should be able to claim it. For me the distribution date was 9/27/2019. I bought the stock as Yahoo in early 2013, so made a tidy profit. I've heard that the remaining distribution should occur sometime this year, we'll see.
