See attached video.

Repro steps:
- Add a light anchor component to a light
- Optionally, assign an object to the Anchor Position Override
- Set any value to Orbit and Roll, but use 90/180/-90 for Elevation
- Change up direction from world to local and back to world

Result:
- The orientation settings are lost and revert to 0

Expected:
- Conversion of the settings is done properly like with other elevation values

Notes: Also works when changing the up direction from local -> world -> local

Reproduces with:
2021.2.11f1, trunk