You can see in other threads people explicitly state they can’t add a link or an image. And I doubt anyone can replace a dot with a comma in a link accidentally, so this is probably done to prevent link detection as well. This is a fairly common occurrence on the forum. Here is another example:
I also remember there was a thread where the person wasn’t able to add a link so someone had to tell them to add a space or something in the URL so its not considered a URL by the forum automatically. Can’t find it now.
Found a bug. Not a critical issue but might be worth reporting to Discourse (if not already reported). The topic was closed automatically after 9 days like after 30 days, probably because the year changes are not considered in this calculation. Ability to move frames around Figma with the attached comments