The "No Whitespace" button is gone #2633

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Since last week the "No Whitespace" button in Pull Request diffs is no longer there.

Example URL: this very repo: https://github.com/sindresorhus/refined-github/pull/2628/files

Expected:

Actual:

Seeing these console errors for other features, may or may not be related:

Happy to do more debugging if you point me in the right direction