Xojo 19.3 ServerSocket crashed

Hi there,
since xojo 19.3 I can no longer use a ServerSocket. My app crashes on start up. With xojo 19.2 there is no problem. Do you know that?
I have 2 apps on MacOS and the problem is with both. The MacOS version has no influence.
The trace looks like this.

0312D88A: RuntimeRaiseException
030B84A2: _Z19RaiseExceptionClassRK13ClassDeclBase
0314884F: _Z30ServerSocketFireAddSocketEventP19ServerSocketControl
02FEF9FC: XojoFramework$6654
02FEF2B4: _ZN19ServerSocketPackage14AddSocketEventEv
02FEEFC2: _ZN9TCPSocket10FireEventsEv
02FEBAB1: _ZN14TCPSocketPosix4PollEv
02FEE2F0: _Z9DoNetIdleh
0300EB24: XojoFramework$7352
03032D4E: XojoFramework$8135
3BD66804: CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION
3BD663BE: __CFRunLoopDoTimer
3BD65E9E: __CFRunLoopDoTimers
3BD4AAED: __CFRunLoopRun
3BD49BD3: CFRunLoopRunSpecific
3A89F65D: RunCurrentEventLoopInMode
3A89F39D: ReceiveNextEventCommon
3A89F127: _BlockUntilNextEventMatchingListInModeWithFilter
38F0FBA4: _DPSNextEvent
38F0E380: -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:]
02FB0C59: XojoFramework$4746
02FB0C9D: XojoFramework$4747
02CDB066: Delegate.Invoke%%
02B71ED7: Application._CallFunctionWithExceptionHandling%%op
0313C645: _Z33CallFunctionWithExceptionHandlingPFvvE
02FB0C06: XojoFramework$4746
38F0009E: -[NSApplication run]
0313AA51: RuntimeRun
02C83095: REALbasic._RuntimeRun
02DB0E28: _Main
02DB02C3: main

Thanks

Ralf,
You should open a Feedback case with all relevant information and an example project, if possible.