Operating system: Darwin-18.7.0-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro 560X OpenGL Engine ATI Technologies Inc. 4.1 ATI-2.11.20
Broken: version: 2.81 (sub 14), branch: master, commit date: 2019-10-09 22:31, hash: rBf61a8a2abd07
Short description of error
When you shift+click to select the bone the object appears as if it's in Object Mode. You can still paint though.
Exact steps for others to reproduce the error
Add a Monkey, add a random armature, link them with automatic weights. Select the armature, the mesh and go into weight paint mode. Select a bone with shift and the bug occurs.