Reproduction Steps:
1. Import attached project.
2. Open Window -> Localization.
3. Drag "loc_master" from Resources -> Localization Tables into the Localization tab.
4. Observe null values.

Note: Issue is fixed once recompile is triggered (for example, by creating a new script).

Expected result: Values are loaded without recompile.
Actual result: Values are null, unless they are recompiled.

Reproducible with: 5.5.1p4, 5.6.0b9

Note: Not reproducible with previous versions.