Occasionally, text goes some unreadable colour. And it crashes when I click while holding down Super. And it only follows the GTK colour scheme sometimes; enabling night mode ended up with a beautiful mix of black-on-black-with-white-stripes.

Oh, and widgets like buttons look like a poor man's copy of Windows 95.

Though, to be fair, I now seem to be unable to trigger the above bugs in the latest build, so I guess it's no longer quite as much of an issue.