That darn knife tool did a number on me during this course when I was working my “Sword” during the live stream. It had a hard time going to different angled planes sometimes and made more cuts than I thought.
I had to toggle X-ray and delete faces and even vertices that were deemed “impossible” and then did the good ‘ol
Merge by Distance Alt + M then B after selecting all my vertices and decreased the distance a little on the merge distance. Then it “fixed” itself enough for me to unwrap.
I both love and hate that darn knife tool.
Actually I find myself unconsciously avoiding it just because the bad taste it left in my mouth, haha.