This easily qualifies as a "gotcha" in CSS and is a good reminder that the cascade doesn't know everything all at the same time. If a custom property is invalid, the cascade won't ignore it, and it gets evaluated, which invalidates the declaration.
Maybe don’t use custom properties in shorthand properties originally published on CSS-Tricks, which is part of the DigitalOcean family. You should get the newsletter.
https://css-tricks.com/maybe-dont-use-custom-properties-in-shorthand-properties/
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