This evening I installed the Pixy2 library in the original 1.8.13 and it installed fine and under File > Examples > Pixy2 shows up with all the examples listed for Pixy2 under 'Examples From Custom Libraries'. All worked as expected.
I installed the latest Pixy2 library in the 2.0 Beta 3. The library worked just fine but the examples included for the Pixy2 showed up above 'Examples From Custom Libraries' and 'sort of included' with examples for UNO and the label was blank. Clicking on the Blank line brought up the names of all the Pixy2 Examples. In Beta 4 the result is the same.
I have attached a screen shot. This could be just the Pixy library but it worked fine in the 1.18.X, however there are other examples from somewhere else, probably from some other library I installed.
(In Beta 4 still get the Git not found and work space error)