We were performing an open operation before we were applying the horizontal expansion. Because of this change narrow overhangs were ignored in the horizontal expansion. This was done on purpose in order to remove superfluous support. This might not be as important anymore since we implemented the "multi layer overhang" requirement.
We got some feed back from the community that support was not being generated for narrow features https://github.com/Ultimaker/Cura/discussions/14637#discussioncomment-5124699.
We were performing an open operation before we were applying the horizontal expansion. Because of this change narrow overhangs were ignored in the horizontal expansion. This was done on purpose in order to remove superfluous support. This might not be as important anymore since we implemented the "multi layer overhang" requirement.