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SUMMARY
KDE connect fails to start, with error:
error activating kdeconnectd: QDBusError("org.freedesktop.DBus.Error.Spawn.ExecFailed", "Failed to execute program org.kde.kdeconnect: No such file or directory")

This can be 'fixed, by editing the dbus service, changing the path to the kdeconnect binary, to be a full absolute path; ie, edit /usr/share/dbus-1/services/org.kde.kdeconnect.service , changing the 'kdeconnect' to be '/usr/bin/kdeconnect'

STEPS TO REPRODUCE
1. Upgrade from a working system to KDE 6.1
 

OBSERVED RESULT
KDE Connect fails to start, with error:
 "error activating kdeconnectd: QDBusError("org.freedesktop.DBus.Error.Spawn.ExecFailed", "Failed to execute program org.kde.kdeconnect: No such file or directory")"

EXPECTED RESULT
KDE Connect continues to start at boot without any interaction.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 6.10
KDE Frameworks Version: 6.3
Qt Version: 6.7.2

ADDITIONAL INFORMATION
I'm on Tumbleweed, but found the 'fix' for this via a gentoo bug report: https://bugs.gentoo.org/934785 and have seen various reports of it on other distros.