@SessionScoped CDI bean fails to serialize when custom Interceptor annotation is applied if the CDI bean has a private method.

Caused by: org.infinispan.commons.marshall.NotSerializableException: org.jboss.weld.bean.proxy.PrivateMethodHandler
Suppressed: org.infinispan.util.logging.TraceException
at org.infinispan.interceptors.impl.SimpleAsyncInvocationStage.get(SimpleAsyncInvocationStage.java:41)
at org.infinispan.interceptors.impl.AsyncInterceptorChainImpl.invoke(AsyncInterceptorChainImpl.java:250)
at org.infinispan.interceptors.InterceptorChain.invoke(InterceptorChain.java:137)
at org.infinispan.transaction.impl.TransactionCoordinator.commit(TransactionCoordinator.java:155)
at org.infinispan.transaction.xa.XaTransactionTable.commit(XaTransactionTable.java:127)
at org.infinispan.transaction.xa.TransactionXaAdapter.commit(TransactionXaAdapter.java:68)
at org.infinispan.commons.tx.TransactionImpl.finishResource(TransactionImpl.java:419)
at org.infinispan.commons.tx.TransactionImpl.commitResources(TransactionImpl.java:466)
at org.infinispan.commons.tx.TransactionImpl.runCommit(TransactionImpl.java:335)
at org.infinispan.commons.tx.TransactionImpl.commit(TransactionImpl.java:110)
at org.wildfly.clustering.ee.infinispan.InfinispanBatch.close(InfinispanBatch.java:97)
at org.wildfly.clustering.web.undertow.session.DistributableSession.requestDone(DistributableSession.java:87)
at io.undertow.servlet.spec.ServletContextImpl.updateSessionAccessTime(ServletContextImpl.java:945)
at io.undertow.servlet.spec.HttpServletResponseImpl.responseDone(HttpServletResponseImpl.java:579)
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:346)
at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81)
at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138)
at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135)
at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)
at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
at org.wildfly.extension.undertow.security.SecurityContextThreadSetupAction.lambda$create$0(SecurityContextThreadSetupAction.java:105)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1502)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1502)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1502)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1502)
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272)
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104)
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:360)
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:830)
at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1985)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1487)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1378)
at java.lang.Thread.run(Thread.java:748)
Caused by: an exception which occurred:
in field test.SessionTestBean$Proxy$_$$_WeldSubclass.privateMethodHandler
in object test.SessionTestBean$Proxy$_$$_WeldSubclass@680b64e9
in field org.jboss.weld.contexts.SerializableContextualInstanceImpl.instance
in object org.jboss.weld.contexts.SerializableContextualInstanceImpl@1492ccbb
in object org.jboss.weld.contexts.SerializableContextualInstanceImpl@1492ccbb
in object java.util.HashMap@b4364ca0