Inconsistent character casing for Entity References.

Using todays 8.x dev, I added an Entity Reference field, and on the relevant Field Settings form is Type of item to reference* select box. The options within that select box do not have consistent character casing, as seen in the attacked image.

For example, there is Custom Block and Custom block type.
The only other similar problem was Unbound Display. There could be more, but not for the entities I had available (pretty much a default standard profile installation).

Im guessing its not Entity References problem, but each entities implementation of a hook? Anyway, this is as good of a place as any to start a fix.