Homematic IP Error on OH 4.1

Hi there,

since I am using openhab 4.1 I get the following error message whenever I use Boost on an Homematic IP Radiator thermostat (HmIP-eTRV-2):

2024-01-08 23:15:32.907 [ERROR] [ternal.handler.HomematicThingHandler] - -1 Generic error (RESPONSE_NAK) (sending <?xml version="1.0" encoding="ISO-8859-1"?>
<methodCall><methodName>setValue</methodName>
<params><param><value>00391F29AD6FD8:1</value></param><param><value>BOOST_MODE</value></param><param><value><boolean>1</boolean></value></param></params></methodCall>)
java.io.IOException: -1 Generic error (RESPONSE_NAK) (sending <?xml version="1.0" encoding="ISO-8859-1"?>
<methodCall><methodName>setValue</methodName>
<params><param><value>00391F29AD6FD8:1</value></param><param><value>BOOST_MODE</value></param><param><value><boolean>1</boolean></value></param></params></methodCall>)
	at org.openhab.binding.homematic.internal.communicator.parser.RpcResponseParser.parse(RpcResponseParser.java:50) ~[bundleFile:?]
	at org.openhab.binding.homematic.internal.communicator.client.XmlRpcClient.sendMessage(XmlRpcClient.java:79) ~[bundleFile:?]
	at org.openhab.binding.homematic.internal.communicator.client.RpcClient.setDatapointValue(RpcClient.java:380) ~[bundleFile:?]
	at org.openhab.binding.homematic.internal.communicator.AbstractHomematicGateway$1.execute(AbstractHomematicGateway.java:691) ~[bundleFile:?]
	at org.openhab.binding.homematic.internal.misc.DelayedExecuter.start(DelayedExecuter.java:65) ~[bundleFile:?]
	at org.openhab.binding.homematic.internal.communicator.AbstractHomematicGateway.sendDatapoint(AbstractHomematicGateway.java:670) ~[bundleFile:?]
	at org.openhab.binding.homematic.internal.communicator.AbstractHomematicGateway.sendDatapoint(AbstractHomematicGateway.java:649) ~[bundleFile:?]
	at org.openhab.binding.homematic.internal.handler.HomematicThingHandler.sendDatapoint(HomematicThingHandler.java:363) ~[bundleFile:?]
	at org.openhab.binding.homematic.internal.handler.HomematicThingHandler.handleCommand(HomematicThingHandler.java:339) [bundleFile:?]
	at jdk.internal.reflect.GeneratedMethodAccessor213.invoke(Unknown Source) ~[?:?]
	at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
	at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?]
	at org.openhab.core.internal.common.AbstractInvocationHandler.invokeDirect(AbstractInvocationHandler.java:147) [bundleFile:?]
	at org.openhab.core.internal.common.InvocationHandlerSync.invoke(InvocationHandlerSync.java:59) [bundleFile:?]
	at jdk.proxy1350.$Proxy1489.handleCommand(Unknown Source) [?:?]
	at org.openhab.core.thing.internal.profiles.ProfileCallbackImpl.handleCommand(ProfileCallbackImpl.java:95) [bundleFile:?]
	at org.openhab.core.thing.internal.profiles.SystemDefaultProfile.onCommandFromItem(SystemDefaultProfile.java:49) [bundleFile:?]
	at jdk.internal.reflect.GeneratedMethodAccessor212.invoke(Unknown Source) ~[?:?]
	at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
	at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?]
	at org.openhab.core.internal.common.AbstractInvocationHandler.invokeDirect(AbstractInvocationHandler.java:147) [bundleFile:?]
	at org.openhab.core.internal.common.Invocation.call(Invocation.java:52) [bundleFile:?]
	at java.util.concurrent.FutureTask.run(FutureTask.java:264) [?:?]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) [?:?]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) [?:?]
	at java.lang.Thread.run(Thread.java:840) [?:?]

I’m using openhabian on a Raspberry Pi 4 Model B Rev 1.5
Today I updated to 4.1.1, made a backup, cleaned the cache etc., but the error is still there.

Can somebody help?

THX in advance.