When I use the /locate command for Ruined Portals and Bastion Remnant the text says "The nearest %feature.ruinedportal is at block...". I remember this also happening in 1.16.0, and I have 1.16.1 right now. Also, the bold text was not bold in Minecraft, I simply put it in bold for detail, and I happened to be at a Ruined Portal when I found this bug.