Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 550 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 376.54
Broken: version: 2.90 (sub 2), branch: master, commit date: 2020-05-20 08:43, hash: rB578b0c00cacb
Worked: (newest version of Blender that worked as expected)
Short description of error
clearing transformations in pose mode does not affect the mirrored bones even when the X-axis mirror is activated.
Exact steps for others to reproduce the error
- Open the .blend file move the last bone "antenna_3.L"
- Move it downward so that other bones move along ( auto IK and X-axis mirror are enabled )
- Now select all the bones on your right side ( .L bones) clear the rotation with Alt+R
Notice that only bones from your right side will clear their transformations but bones on your left side ( .R bones ) are still on the same pose.