React version:

 "react": "18.3.0-next-522f47345-20220614",
 "react-dom": "18.3.0-next-522f47345-20220614",

Steps To Reproduce

<span hidden="until-found">Hello React<span>

Link to code example:

https://codesandbox.io/s/headless-violet-ygn593

The current behavior

React will turn hidden into a boolean attribute and removes "until-found":

The expected behavior

React does not strip "until-found" to allow using hidden-until-found in Chrome 102+ for better SEO and accessibility.