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Scaling an edit bone negatively rolls the bone by 90° instead of 180°
Confirmed, LowPublicKNOWN ISSUE

Description

System Information
Operating system: Windows 10
Graphics card: GTX 1080

Blender Version
Broken: 2.80, 700c69as08ab, master, 2019-05-08

Short description of error
When scaling an edit bone negatively (or moving the tail below the head along its Y axis), the bone rolls by 90° instead of 180°
Here's a video showing the issue:

Exact steps for others to reproduce the error
Create a new armature, enter edit mode, scale the bone by -1

Notes:
I'm working on a add-on that lets you add constraints in edit mode and this breaks the behavior of my "Child Of" constraints as you can see below.
The small bone is constrained to the larger one. Instead of sliding along the Y axis, the "child" slides along X when its "parent" is scaled negatively.

Event Timeline

Sebastian Parborg (zeddb) lowered the priority of this task from 90 to Low.May 9 2019, 4:03 PM
Bastien Montagne (mont29) changed the subtype of this task from "Report" to "Known Issue".Jan 22 2020, 11:40 AM

Would consider that a known issue for now…