:focus-visible is set when I click in a sub element in label

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### What is affected?

Accessibility, Component

### Description

When I click in a sub element in label to focus the checkbox, the checkbox is focused with :focus-visible state. I expected it to be focused without this state (like when we click directly on the label).

### Reproduction

The checkbox must not have :focus-visible state when we click on the red span.
https://lit.dev/playground/#project=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-XG4gICAgICAgICAgPGxhYmVsPjxtZC1jaGVja2JveD48L21kLWNoZWNrYm94PkNhbiBjbGljayA8c3Bhbj53aXRoIDpmb2N1cy12aXNpYmxlPC9zcGFuPjwvbGFiZWw-XG4gICAgICAgIDwvZGl2PlxuICAgICAgICA8ZGl2PlxuICAgICAgICAgIDxsYWJlbD48bWQtZmlsbGVkLXRleHQtZmllbGQ-PC9tZC1maWxsZWQtdGV4dC1maWVsZD5DYW4gY2xpY2sgPHNwYW4-Y2FuJ3QgY2xpY2s8L3NwYW4-PC9sYWJlbD5cbiAgICAgICAgPC9kaXY-XG4gICAgYDtcbiAgfVxufVxuIn0seyJuYW1lIjoiaW5kZXguaHRtbCIsImNvbnRlbnQiOiI8IURPQ1RZUEUgaHRtbD5cbjxoZWFkPlxuICA8c2NyaXB0IHR5cGU9XCJtb2R1bGVcIiBzcmM9XCIuL3NpbXBsZS1ncmVldGluZy5qc1wiPjwvc2NyaXB0PlxuPC9oZWFkPlxuPGJvZHk-XG4gIDxzaW1wbGUtZ3JlZXRpbmcgbmFtZT1cIldvcmxkXCI-PC9zaW1wbGUtZ3JlZXRpbmc-XG48L2JvZHk-XG4ifSx7Im5hbWUiOiJwYWNrYWdlLmpzb24iLCJjb250ZW50Ijoie1xuICBcImRlcGVuZGVuY2llc1wiOiB7XG4gICAgXCJsaXRcIjogXCJeMy4wLjBcIixcbiAgICBcIkBsaXQvcmVhY3RpdmUtZWxlbWVudFwiOiBcIl4yLjAuMFwiLFxuICAgIFwibGl0LWVsZW1lbnRcIjogXCJeNC4wLjBcIixcbiAgICBcImxpdC1odG1sXCI6IFwiXjMuMC4wXCIsXG4gICAgXCJAbWF0ZXJpYWwvd2ViXCI6IFwiXjEuNS4xXCJcbiAgfVxufSJ9XQ

### Workaround

No

### Is this a regression?

No or unsure. This never worked, or I haven't tried before.

### Affected versions

Failing in 1.5.1

### Browser/OS/Node environment

Chrome v. 126

Start with the Lit playground reproduction in the issue, focusing on the md-checkbox inside a label and the nested red span, then reproduce the behavior in Chrome 126. Trace how clicking the span focuses the checkbox and compare it with clicking the label directly. Done means the checkbox does not receive :focus-visible when focus results from clicking the nested span.

Written by the indexing model from the issue text.