After typing some text using the artistic text tool, I wanted to highlight a couple of the characters to make them Superscript but I noticed that the text was not highlighting. I restarted Affinity Designer and tried again, same issue. I just happened to zoom out while I was trying to figure out what was going on and then the text appeared highlighted. I zoomed back in and the highlighting went away again, zoomed out and highlight returned. So it's whenever I reach a specific point of zooming in that the highlight disappears.
Even though it doesn't show the highlight, it still acts as though the highlight is there, I was able to apply the superscript effect even when I couldn't see the highlight.
2020.06.04-07.35.mp4
2020_06_06-15_53.mp4