Super Mario Maker 2 has a lot of mechanical carryover from its predecessor, including one very specific bug involving faithful steed Yoshi, a held item, and a Fire Flower. It's a slightly complicated setup that could nonetheless crash your software, and users have already posted videos showing it in action.
The setup is that you have to jump onto a Yoshi's back while holding an item, facing towards the camera, and while a Fire Flower is on-screen. This causes a software freeze, as recorded by one Twitch user and showcased in detail by GameXplain.
This bug existed in the first Super Mario Maker as well, where it was reportedly used by some players to create troll levels. Put down some inconspicuous Mario stuff, then leave out the right things, and bam. Until it gets fixed, our advice is: if you see Yoshi and a Fire Flower, don't jump onto it while holding something. Again, it's a very specific setup, but the heart of Mario Maker is submitting other people to your most evil machinations.
In good news, besides a mild Yoshi issue, we've been digging Super Mario Maker 2. As Mike notes in his review, "Super Mario Maker 2 is a sequel, when all Nintendo really needed to do was port the original over." It has a night mode and tons of new items, even more thanks to the 3D World theme. It even has a story mode, with a strangely anti-union Toadette. C'mon Toadette, let the Toads organize!