Maker pen on screen mode is still bugged after June 9th update.
Meanwhile, since it works just fine on an alt account, I tried to see what settings could be different between my main account (this one I’m using right now to post on the forum) and my alt account. I couldn’t figure it out.
I thought maybe it was some inventions that prevented that, so I deleted a bunch of downloaded and unpublished inventions, with no success.