Same issue WinPerRelease 023.000.0432.
There are multiple issues here. One is you cannot delete an imported 1099-B entry. You can click the trash can to accept but when you go back to the summary it shows the same number of entries and now a DIFFERENT gain/loss. Furthermore, it changes the quantity of shares on the remaining, undeleted, entries. I've tried multiple times.
This appears to be a recent bug as I completed a different tax return last weekend and didn't have an issue deleting imported1099-B entries.
