Unexpected behavior when mirroring: values copied over from one side to the other without negative applied

[buzzkirill]

• After creating a mirror table for a skeleton using the YZ plane (default):
• Pose created: right control XYZ translation values 1, 1, 1; left control XYZ 0;0;0
• Pose mirrored.
• Expected output: right 0;0;0, left -1; 1; 1.
• Actual output: right 0;0;0, left 1;1;1

Why aren't negative values applied to the corresponding objects?

Maya version 2023.2