Warning - java.lang.IllegalStateException: channel not registered to an event loop After upgrade to v4.2.0

Description
Recently, I upgrade my SpringCloudGateway service from v4.1.5 to v4.2.0. Also upgraded SpringBoot from v3.3.5 to v3.4.2. Whenever I do deployment my service generates warning

{"timestamp":"2025-02-08T10:37:22.014Z","source":"io.netty.util.concurrent.AbstractEventExecutor","thread":"reactor-http-epoll24", "level":"WARN",
"stack_trace":"java.lang.IllegalStateException: channel not registered to an event loop
	at io.netty.channel.AbstractChannel.eventLoop(AbstractChannel.java:163)
	at io.netty.channel.AbstractChannelHandlerContext.executor(AbstractChannelHandlerContext.java:132)
	at io.netty.channel.AbstractChannelHandlerContext.newPromise(AbstractChannelHandlerContext.java:1011)
	at io.netty.channel.AbstractChannelHandlerContext.close(AbstractChannelHandlerContext.java:560)
	at io.netty.channel.DefaultChannelPipeline.close(DefaultChannelPipeline.java:906)
	at io.netty.channel.AbstractChannel.close(AbstractChannel.java:243)
	at reactor.netty.http.client.HttpClientOperations.onInboundCancel(HttpClientOperations.java:320)
	at reactor.netty.channel.FluxReceive.disposeAndUnsubscribeReceiver(FluxReceive.java:490)
	at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:173)
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:166)
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472)
	at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:405)
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.base/java.lang.Thread.run(Unknown Source)",
"message":"A task raised an exception. Task:reactor.netty.channel.FluxReceive$$Lambda/0x00000001005b9c80@77ca8cc7"}

Upgrade Detail

• spring_boot_version= from 3.3.4 to 3.4.2
• spring_cloud_gateway_version= from 4.1.5 to 4.2.0
• spring_dependency_management_version=from 1.1.6 to 1.1.7
• spring_cloud_dependency_version=from 2023.0.3 to 2024.0.0

Other Details

• Using Java 21 (azuljre:21.34.19-alpine-3.20)
• Jib for building Image
• K8s

Start with the reported stack trace through reactor.netty.channel.FluxReceive, reactor.netty.http.client.HttpClientOperations, and io.netty.channel.AbstractChannel, comparing behavior across the listed Spring Boot and Spring Cloud Gateway upgrades. Reproduce deployment with Java 21 and the reported environment, then verify that the warning no longer occurs and document the triggering request or shutdown path.