Does Google Chrome have a bug with css: background-position-y: bottom 40%?

In Chrome/Dev tools: Using the shorthand:

background-position: bottom 40% center;

seems be correctly "translated" into its background-position-x and background-position-y parts.

Yet the exact same string is marked invalid and won’t also work in the UI:

background-position-y: bottom 40%;

It seems to work in Firefox:

I tested with Chrome versions:

Where can this be reported, if necessary?

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