Not sure if it’s my specific app or lemmy as a whole, but that spoiler tag isn’t working. Sometimes they’ll break if you put a space between the tag and your text.

… >! Testing with spaces on both ends !<

… >! Testing with a space at the front!<

… >!Testing with a space at the end !<

… >!Testing with no spaces!<

Looks like reddit spoiler tags just don’t work in general