Operating system: Apple macOS Mojave
Graphics card: Intel Iris Graphics 550 1536 MB
Broken: (example: 2.80, edbf15d3c044, master, 2018-11-28, as found on the splash screen)
Short description of error
the weapon bone that is a child of the character's root bone gets rotated by 180 degrees on the y-axis when I export the blender file as an fbx. The bone gets rotated inside blender as well as in the fbx file
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).