Just like my first project on my main account, this one isn't all that exciting xD I just noticed that clicking the tab bar on someone else's project with 3 tags causes it to flash red and show the error "Limit of 3 tags." Projects with no tags don't have a visible tag bar, so I'm testing what happens when you have a project with 1/2 tags. I have a theory that they're publicly addable like in Scratch 1.x (but that's pretty useless with the limit of 3), in which case I might write an userscript to add a tab bar to other's people's projects with no tags. UPDATE: I was wrong, they can only be added by the project's owner, which means the error shouldn't be happening. Reported to the Scratch Team.