Hello,
In the Trixie release notes at https://www.debian.org/releases/trixie/release-notes/issues.en.html#security-status-of-web-browsers-and-their-rendering-engines one finds

However that source package doesn't exist anymore and I don't think Qt WebKit does anymore either. Instead Qt's web technology stuff has splintered into a few source packages that (if I recall correctly) uses the Blink engine instead of WebKit. In /usr/share/debian-security-support/security-support.deb13 one finds as an apparent successor the following:

That package is implicitly for Qt 5, but Trixie includes Qt 6 also and its equivalent, 'src:qt6-webengine', isn't mentioned anywhere at all. I suppose the release notes don't need to mention that source package (or indeed any of them) by name, but you may want to get Security Team confirmation (such as in my secondary bug report) before finalizing a change in wording.

Thanks for your attention.