I have seen no change in the law and I have been doing the same Fiduciary Estate return for 4 years (as well as 2 others, same distribution, during that time).  Prior to 2020, put a 2 (prorate to beneficiary) on the line in Screen 9, Credits, and boom, straight to K-1 Line 13 code B, exactly like it is supposed to.  What's really pissing me off is Lacerte's lack of response on this.