Not sure if bug, but...
Say I have a flex parent with flex children. The flex children have some of the options greyed out because they are flex children. Good. Makes sense. Expected.
But elements inside the flex children ALSO have those options greyed out, even though they are not flex children. They're flex grandchildren, which I don't think is a thing. Odd thing is, the flex child has display block already set by default.
In order to be able to un-grey the options on these so-called flex grandchildren, I have to manually hard set its parent (which is a flex child) to be display block so that it turns blue.