"There are still SSE events the queue which may not be delivered (closing now)" after migrating from OH2.5 to OH3.3

Not sure if this is migration issue or not - but after migrating to OH3.3 (new hardware with imported settings) I have really a lot of these log messages

2022-12-13 19:40:20.216 [WARN ] [pache.cxf.jaxrs.sse.SseEventSinkImpl] - There are still SSE events the queue which may not be delivered (closing now)
2022-12-13 19:40:24.451 [WARN ] [pache.cxf.jaxrs.sse.SseEventSinkImpl] - There are still SSE events the queue which may not be delivered (closing now)
2022-12-13 19:41:41.071 [WARN ] [pache.cxf.jaxrs.sse.SseEventSinkImpl] - There are still SSE events the queue which may not be delivered (closing now)
2022-12-13 19:42:20.174 [WARN ] [pache.cxf.jaxrs.sse.SseEventSinkImpl] - There are still SSE events the queue which may not be delivered (closing now)
2022-12-13 19:43:04.399 [WARN ] [pache.cxf.jaxrs.sse.SseEventSinkImpl] - There are still SSE events the queue which may not be delivered (closing now)
2022-12-13 19:54:39.394 [WARN ] [pache.cxf.jaxrs.sse.SseEventSinkImpl] - There are still SSE events the queue which may not be delivered (closing now)
2022-12-13 19:56:21.079 [WARN ] [pache.cxf.jaxrs.sse.SseEventSinkImpl] - There are still SSE events the queue which may not be delivered (closing now)
2022-12-13 19:56:29.396 [WARN ] [pache.cxf.jaxrs.sse.SseEventSinkImpl] - There are still SSE events the queue which may not be delivered (closing now)
2022-12-13 19:56:29.396 [WARN ] [pache.cxf.jaxrs.sse.SseEventSinkImpl] - There are still SSE events the queue which may not be delivered (closing now)
2022-12-13 19:57:14.436 [WARN ] [pache.cxf.jaxrs.sse.SseEventSinkImpl] - There are still SSE events the queue which may not be delivered (closing now)
2022-12-13 19:57:14.436 [WARN ] [pache.cxf.jaxrs.sse.SseEventSinkImpl] - There are still SSE events the queue which may not be delivered (closing now)
2022-12-13 19:57:23.975 [WARN ] [pache.cxf.jaxrs.sse.SseEventSinkImpl] - There are still SSE events the queue which may not be delivered (closing now)
2022-12-13 19:57:31.082 [WARN ] [pache.cxf.jaxrs.sse.SseEventSinkImpl] - There are still SSE events the queue which may not be delivered (closing now)
2022-12-13 19:57:43.971 [WARN ] [pache.cxf.jaxrs.sse.SseEventSinkImpl] - There are still SSE events the queue which may not be delivered (closing now)
2022-12-13 19:57:49.396 [WARN ] [pache.cxf.jaxrs.sse.SseEventSinkImpl] - There are still SSE events the queue which may not be delivered (closing now)
2022-12-13 19:59:09.417 [WARN ] [pache.cxf.jaxrs.sse.SseEventSinkImpl] - There are still SSE events the queue which may not be delivered (closing now)
2022-12-13 19:59:09.422 [WARN ] [pache.cxf.jaxrs.sse.SseEventSinkImpl] - There are still SSE events the queue which may not be delivered (closing now)
2022-12-13 19:59:30.228 [WARN ] [pache.cxf.jaxrs.sse.SseEventSinkImpl] - There are still SSE events the queue which may not be delivered (closing now)
2022-12-13 20:18:39.413 [WARN ] [pache.cxf.jaxrs.sse.SseEventSinkImpl] - There are still SSE events the queue which may not be delivered (closing now)
2022-12-13 20:22:40.263 [WARN ] [pache.cxf.jaxrs.sse.SseEventSinkImpl] - There are still SSE events the queue which may not be delivered (closing now)

What could be the problem?

Is here really nothing to try?
Any hint how to find the root cause?