Qt 6.8.0 on Solaris as used with Wireshark (tested with 4.2.6 and 4.4.0) hangs on exit:

 wireshark:7548*> $C
    7ff316135520 libc.so.1`__lwp_park+0x12()
    7ff316135550 libc.so.1`cond_wait_queue+0x67()
    7ff316135580 libc.so.1`__cond_wait+0x85()
    7ff3161355a0 libc.so.1`cond_wait+0x1e()
    7ff3161355b0 libc.so.1`pthread_cond_wait+9()
    7ff316135640 libQt6Core.so.6.8.0`QWaitCondition::wait+0x17f()
    7ff3161356b0 libQt6Core.so.6.8.0`QThread::wait+0x91()
    7ff316135700 libQt6DBus.so.6.8.0`QDBusConnectionManager::~QDBusConnectionManager+0x40()
    7ff316135710 libQt6DBus.so.6.8.0`QtGlobalStatic::Holder<+0xe()
    7ff316135750 libc.so.1`_exithandle+0x74()
    7ff316135770 libc.so.1`exit+0x11()
    7ff316135790 exit_application+0x24()
    7ff316135a80 main+0x2a2()
    7ff316135a90 _start+0x43()

With old Qt 6.7.0 there is no problem/hang and Wireshark exits immediately.