I use Hover Editor daily, but don’t have any banners in my notes. I’ll set up a banner in a note when I get a few minutes and report back.
Hopefully someone can jump in, but you could have a scroll through the Hover Editor issues page: https://github.com/nothingislost/obsidian-hover-editor/issues to see if anything turns up.
I would check Pixel Banner’s GitHub page as well.