The syntax of text-underline-position is auto | [ under || [ left | right ] ] which means auto should never be combined with other values.
However, in Appendix B: Default UA Stylesheet, we have
:root:lang(ja), [lang|=ja],
:root:lang(mn), [lang|=mn],
:root:lang(ko), [lang|=ko] { text-underline-position: auto right; }
:root:lang(zh), [lang|=zh] { text-underline-position: auto left; }
which doesn't match the syntax above.
One of them should be updated.
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