"Two by Two" advancement requires breeding mules, but mules can't breed

Mules and donkeys were added to the requirements for "Two by Two" (breed all animals) in 1.16-pre1, but mules cannot breed. This makes the advancement impossible to get. Tested in 1.16-rc1.

 

To reproduce:

-Feed two mules golden carrots

-Love hearts appear, but they don't produce a baby as expected

-No progress is made on "Two by Two"