Form 8879 now requires a tax year to be entered at the top of the form (so the taxpayer & preparer know/agree on which tax year the signature is for).
Please make this field show an error (red, pink, whatever) until a tax year has been entered by the preparer in that field.
I'm using the CAGMC approach - I'm leaving it blank.
I havent been entering it either, sometimes I remember to write the 2020 up in the top corner when I sign it, sometimes I dont.
I did go in and edit the client template, and input the 20 on the line so it shows up on all new clients, doesnt work for existing clients though.
I try to remember but a few slip thru. I figure it shouldn't hard to match up to the correct tax return with the amounts on lines 1-5 if there is ever a question to which year it is for.