build 8.0.0-beta0 (b2018110708)
Not particularly a bug, but rather an annoyance. The colour picker displays unnecessarily narrow to see all of the tabs, all of which are used regularly. In particular I tend to use HSL most often, which is the tab that is hidden 
Yes, this is something we noticed and have an open feature ticket for, but it will be some time before it gets any attention since the other options are still accessible.
it would be nice if the color picker would open up displaying the tab that you most recently used.