The KDE Qt5 Patch Collection has been rebased on top of Qt 5.15.5
Commercial release announcement: https://www.qt.io/blog/commercial-lts-qt-5.15.5-released
OpenSource release announcement: https://lists.qt-project.org/pipermail/development/2022-June/042659.html
I want to personally extend my gratitude to the Commercial users of Qt for beta testing Qt 5.15.5 for the rest of us.
The Commercial Qt 5.15.5 release introduced some bugs that have later been fixed. Thanks to that, our Patchset Collection has been able to incorporate the reverts for those bugs     and the Free Software users will never be affected by those!