QDBusServer has never really worked.
QDBusServer documentation should indicitate its non-functional
QtDBus lacks peer-to-peer support
Daniele E. Domenichelli just made a merge request that apparently fixes this issue
This task is old and has been idle for a long time. It is therefore being closed on the assumption that it will not be addressed in the foreseeable future. If you really do care about this task, you may reopen it and vote for it.
Reopening. The MR is being merged.
Resolved when merging in MR#2343
Note that QTBUG-24921 severely limits QDBusServer functionality.