Shadow DOM breaks CSS inherit

[eric-starke]

I am using these rules in my stylesheet to inherit the box-sizing attribute from root:

*,
*::before,
*::after {
  box-sizing: inherit;
}

:root {
  box-sizing: border-box;
}

When the user of my website has the LanguageTool extension installed, breaks this the inheritance for the elements that are inserted into a <slot> by the extension.
Is it possible to fix this on your side? I found a fix for this case, but there could be more unintended style changes regarding inherit.

[tiff]

Thanks, allow us some time to investigate.