Operating system: Linux-5.8.0-7630-generic-x86_64-with-glibc2.32 64 Bits
Graphics card: AMD Radeon RX 5700 XT (NAVI10, DRM 3.38.0, 5.8.0-7630-generic, LLVM 11.0.0) AMD 4.6 (Core Profile) Mesa 20.3.2
Broken: version: 3.0.0 Alpha, branch: asset-browser-poselib, commit date: 2021-05-11 09:39, hash: `rB745505278d3c`
Worked: (newest version of Blender that worked as expected)
**Short description of error**
When applying a pose including (lattice controls) with 'Flip Pose' enabled, the lattices behave unexpectedly, rotating in 180 degrees. even though their rotation value stored on the poselibrary is 0,0,0.
**Exact steps for others to reproduce the error**
Append/link a character with lattice controls in a file
after hitting 'n' in the viewport, Open the 'animation tab'
Create a pose with the lattices included and save it to the poselibrary. The pose will be stored in the 'current file'.
Then enable 'Flip Pose'.
Click and drag on the just created poselibrary pose and the lattice will rotate 180 degrees.
File will be included shortly.