Reproduction steps:
1. Create a new project
2. Edit > Project Settings… > Graphics
3. Expand Keyword Declaration Overrides foldout and press “+” button
4. Enter two of the same values in the Keyword set field (e.g “a” and “a”) and observe the error below the Keyword set
5. Enter any number in the Keyword set field and observe
6. Press “Apply” button and observe the Console

Actual result: Only “‘1’ is not a valid keyword.” Error is displayed
Expected result: Both “’1’ is not a valid keyword.” and “Duplicate keywords: a” errors are displayed

Reproducible with: 6000.3.3f1, 6000.4.0b3, 6000.5.0a4
Couldn’t reproduce with: 6000.0.65f1 (No Keyword Declaration Overrides)

Reproduced on: macOS Tahoe 26.1 (M4), Windows 11