Custom variant '{name}' overrides a built-in token. The built-in colours are contrast-checked in both themes; the override is now your responsibility.

Warnings reference › variant-override:*

Identifier

variant-override:*

Raised by

The grid (rendering)

Since

1.0.1

What happened

A custom variant was registered under the name of a built-in, and it replaced it. Nothing is broken and the registration stands; the point of the line is that the built-in's contrast guarantee no longer applies to any cell using that token, anywhere in the application.

The fix

Register under a name of your own if you did not mean to replace the built-in. If you did, check the contrast of both themes yourself.

Reference

Covered in full at the API reference.