Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 980/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.07
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: rBf6cb5f54494e
Short description of error
using auto IK with the select tool while mirror is active is not mirroring. rotate is mirroring fine. additionally moving with auto IK makes the mirrored joints that should be moving, jump to random rotations (see gif)
Exact steps for others to reproduce the error
load this file.
enter pose mode
choose the select tool (so that left drag will move objects)
activate x-axis mirror
activate Auto IK
drag one foot.
drag the other foot.
(note the first foot jumps)