Thanks, Amy!
I do see that form 8453 will be required if you make adjustments to cost basis which would include the case of a wash sale. Good to point that out for this thread.
Just to further clarify: I had no adjustments of any kind, no wash sales, just plain vanilla non-summarized transactions.
I am still left with the conclusion - at least in my case - that this is a bug in TT. I can't say what triggered it, I only have a guess.
Though clearly posting the reasons like summarization of transactions and adjustments to cost basis will help people understand what the legitimate triggers will be. And to reduce confusion also posting what documents people need to send via paper will help as there are conflicting answers. Thanks.
