"New" highlight doesn't work on buttons in stack

I have been using the “New” highlight in my button bundle.yaml files. However, I was just re-arranging some of my tools and I noticed that when I put a button in a stack, the “New” highlight doesn’t appear anymore. Is it just because they are too small when put in a stack, so the highlights don’t show?

i had the same issue. i actually added this as a bug.