It works fine on here on meta using iOS 26.1, but on another forum (I’d guess months out of date) it’s not working correctly. That forum was working fine before I updated to iOS 26.
I was also able to break it (less so) on a Discourse hosted instance by minimizing the editor (the double down arrow) and reopening it.
Also very much broke here as I was editing this message. See the following screenshot where it’s actually deleting the line above where the cursor is.
