O.K., after the reboot I had too many problems (some rules weren’t working und the bindings stops working within the same day).
So I rolled back the hole system to v2.5.12 and will take a further look to these two bindings. When the system is running stable I will take a new trial for the upgrade to v3.
//Edit: I found the same error like here discribed , but there is no solution. 
Here the part from the openhab.log
2021-02-20 13:59:34.664 [DEBUG] [internal.handler.DeconzBridgeHandler] - Get full state failed
java.util.concurrent.CompletionException: java.util.concurrent.TimeoutException: Total timeout 3000 ms elapsed
at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:331) ~[?:?]
at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:346) ~[?:?]
at java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:632) ~[?:?]
at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:506) [?:?]
at java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:2088) [?:?]
at org.openhab.binding.deconz.internal.netutils.AsyncHttpClient$1.onComplete(AsyncHttpClient.java:109) [bundleFile:?]
at org.eclipse.jetty.client.ResponseNotifier.notifyComplete(ResponseNotifier.java:198) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.client.ResponseNotifier.notifyComplete(ResponseNotifier.java:190) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.client.HttpReceiver.terminateResponse(HttpReceiver.java:444) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.client.HttpReceiver.abort(HttpReceiver.java:527) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.client.HttpChannel.abortResponse(HttpChannel.java:156) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.client.HttpChannel.abort(HttpChannel.java:149) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.client.HttpExchange.abort(HttpExchange.java:257) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.client.HttpConversation.abort(HttpConversation.java:149) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.client.HttpRequest.abort(HttpRequest.java:768) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.client.TimeoutCompleteListener.onTimeoutExpired(TimeoutCompleteListener.java:51) [bundleFile:9.4.20.v20190813]
at org.eclipse.jetty.io.CyclicTimeout$Wakeup.run(CyclicTimeout.java:282) [bundleFile:9.4.20.v20190813]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) [?:?]
at java.util.concurrent.FutureTask.run(FutureTask.java:264) [?:?]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304) [?:?]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?]
at java.lang.Thread.run(Thread.java:834) [?:?]
Caused by: java.util.concurrent.TimeoutException: Total timeout 3000 ms elapsed
... 8 more
2021-02-20 13:59:48.155 [TRACE] [nternal.netutils.WebSocketConnection] - Raw data received by websocket ESH-httpClient-conz-deconz-b5f7dc6c$3209424: {“attr”:{“id”:“2”,“lastannounced”:null,“lastseen”:“2021-02-20T12:59Z”,“manufacturername”:“dresden elektronik”,“modelid”:“ConBee II”,“name”:“Configuration tool 2”,“swversion”:“0x00000000”,“type”:“Configuration tool”,“uniqueid”:“00:21:2e:ff:ff:06:15:be-01”},“e”:“changed”,“id”:“2”,“r”:“lights”,“t”:“event”,“uniqueid”:“00:21:2e:ff:ff:06:15:be-01”}
2021-02-20 13:59:48.158 [TRACE] [nternal.netutils.WebSocketConnection] - Couldn’t find light listener for id 2
2021-02-20 13:59:55.396 [TRACE] [nternal.netutils.WebSocketConnection] - Raw data received by websocket ESH-httpClient-conz-deconz-b5f7dc6c$3209424: {“attr”:{“colorcapabilities”:31,“ctmax”:1000,“ctmin”:100,“id”:“1”,“lastannounced”:“2021-01-10T17:22:13Z”,“lastseen”:“2021-02-20T12:59Z”,“manufacturername”:“innr”,“modelid”:“FL 140 C”,“name”:“Terrassenlicht”,“swversion”:“0x27202162”,“type”:“Extended color light”,“uniqueid”:“00:15:8d:00:05:01:8a:58-01”},“e”:“changed”,“id”:“1”,“r”:“lights”,“t”:“event”,“uniqueid”:“00:15:8d:00:05:01:8a:58-01”}
2021-02-20 13:59:55.400 [TRACE] [z.internal.handler.LightThingHandler] - deconz:extendedcolorlight:b5f7dc6c:00158d0005018a5801 received LightMessage{hascolor=null, ctmax=null, ctmin=null, type=null, state=null, e=‘changed’, r=‘lights’, t=‘event’, id=‘1’, manufacturername=’’, modelid=’’, name=’’, swversion=’’, ep=’’, uniqueid=‘00:15:8d:00:05:01:8a:58-01’}
2021-02-20 14:00:05.023 [TRACE] [nternal.netutils.WebSocketConnection] - Raw data received by websocket ESH-httpClient-conz-deconz-b5f7dc6c$3209424: {“attr”:{“id”:“3”,“lastannounced”:“2021-02-12T07:39:25Z”,“lastseen”:“2021-02-20T13:00Z”,“manufacturername”:“IKEA of Sweden”,“modelid”:“TRADFRI Driver 10W”,“name”:“Vitrine_WZ”,“swversion”:“1.2.245”,“type”:“Dimmable light”,“uniqueid”:“84:2e:14:ff:fe:79:cc:1d-01”},“e”:“changed”,“id”:“3”,“r”:“lights”,“t”:“event”,“uniqueid”:“84:2e:14:ff:fe:79:cc:1d-01”}
2021-02-20 14:00:05.027 [TRACE] [z.internal.handler.LightThingHandler] - deconz:dimmablelight:b5f7dc6c:842e14fffe79cc1d01 received LightMessage{hascolor=null, ctmax=null, ctmin=null, type=null, state=null, e=‘changed’, r=‘lights’, t=‘event’, id=‘3’, manufacturername=’’, modelid=’’, name=’’, swversion=’’, ep=’’, uniqueid=‘84:2e:14:ff:fe:79:cc:1d-01’}