System Information
Operating system:macOS mojave 10.14.4
Graphics card:intel iris 550

Blender Version
Broken: 2.8 d525c76003b3
Worked: 2.8 3dc9da3a74ee

Short description of error

can't select armature other than on the root bone

Exact steps for others to reproduce the error
create armature (single bone)
in edit mode extrude top bone once or twice
go into object mode
try selecting armature by clicking/box selecting on just the extruded bone

this maybe a mac os/intel card thing as things are working fine on other systems with the same build. since none of the extruded bones are selectable though in object or edit mode it makes rigging impossible.

EDIT - resolved in latest build