After update, system have libQt5Core 5.15 version, but QGIS compiled with Qt_5.14.1.
Who can recompile QGIS with new library? When?
Hi and welcome to the Forum 
I would surmise it’s part of the switch to gcc10 fallout since it’s failing to build;
https://build.opensuse.org/package/show/Application:Geo/qgis
Bug report is here (and reported upstream);
https://bugzilla.opensuse.org/show_bug.cgi?id=1172451