"Duplicate keywords" error appears when entering “_” and “__” in Graphics Keyword Declaration Overrides

Unity: Shader System

As Designed

6.5.X

6000.5.0a4 onwards

6.4.X

6000.4.0b3 onwards

Both `_` and `__` (and any number of underscores) are treated as "no keyword".

Reproduction steps:
1. Create a new project
2. Edit > Project Settings… > Graphics
3. Expand Keyword Declaration Overrides foldout and press “+” button
4. Enter “_" and “__” values in the Keyword set field

Actual result: "Duplicate keywords: _” error appears below the Keyword set
Expected result: No errors or warnings appear

Reproducible with: 6000.4.0b3, 6000.5.0a4
Not reproducible with: 6000.3.3f1, 6000.4.0b2
Couldn’t reproduce with: 6000.0.65f1 (No Keyword Declaration Overrides)

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

"Duplicate keywords" error appears when entering “_” and “__” in Graphics Keyword Declaration Overrides

Unity: Shader System

As Designed

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Have a workaround or additional info about this issue?

"Duplicate keywords" error appears when entering “_” and “__” in Graphics Keyword Declaration Overrides

Unity: Shader System

Statuses

As Designed

Resolution Notes

6.5.XAs DesignedBoth `_` and `__` (and any number of underscores) are treated as "no keyword".

Description

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Have a workaround or additional info about this issue?