I tried to fix it, but from Voyager (wefwef.app)'s side it was even worse, so I undid it. It's working fine on the desktop, and following Lemmy's commonmark guide, so I think that the issue is from wefwef's side of the things (check if there's a bug report about this in their github).
It works on Jerboa. BTW, reddit edited r/place and removed all of those messages shortly after they were created. There's a video of it happening somewhere out there.