I got the detail from the Steegmuller biography. https://archive.org/details/in.ernet.dli.2015.62447/page/n13...
I believe it refers to this painting, which has, I believe, changed attribution, but which is still referred to as by a "Breughel follower". https://www.nga.gov/collection/art-object-page.41602.html#:~....