System fonts are not displayed in the correct style for their idiom in compatilibily mode on visionOS.
<rdar://problem/107389870>
Pull request: https://github.com/WebKit/WebKit/pull/16411
Committed 266710@main (7ef05e80175b): <https://commits.webkit.org/266710@main> Reviewed commits have been landed. Closing PR #16411 and removing active labels.