Spring Webflex - reactor core exception - accessing endpoint with http: basic auth

I'm sure this shouldn't happen, but when I try to access an endpoint requiring basic http authentication, from postman, but in postman set authetication to none, instead of getting not authenticated / not authorized back, Spring Boot throws an exception and crashes,

2024-07-02T21:54:33.799+01:00 WARN 79450 --- [ parallel-1] reactor.core.Exceptions : throwIfFatal detected a jvm fatal exception, which is thrown and logged below:

java.lang.StackOverflowError: null
	at reactor.core.publisher.InnerOperator.currentContext(InnerOperator.java:33) ~[reactor-core-3.5.11.jar:3.5.11]
	at reactor.core.publisher.MonoFlatMap$FlatMapInner.currentContext(MonoFlatMap.java:270) ~[reactor-core-3.5.11.jar:3.5.11]
	at reactor.core.publisher.InnerOperator.currentContext(InnerOperator.java:33) ~[reactor-core-3.5.11.jar:3.5.11]
	at reactor.core.publisher.InnerOperator.currentContext(InnerOperator.java:33) ~[reactor-core-3.5.11.jar:3.5.11]
	at reactor.core.publisher.InnerOperator.currentContext(InnerOperator.java:33) ~[reactor-core-3.5.11.jar:3.5.11]
	at reactor.core.publisher.InnerOperator.currentContext(InnerOperator.java:33) ~[reactor-core-3.5.11.jar:3.5.11]
	at reactor.core.publisher.InnerOperator.currentContext(InnerOperator.java:33) ~[reactor-core-3.5.11.jar:3.5.11

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Start by reproducing the reported Spring WebFlux endpoint request with HTTP basic authentication enabled and no credentials in Postman, then inspect the Reactor stack trace showing repeated InnerOperator.currentContext calls. Done means the unauthenticated request returns an authentication or authorization response without a StackOverflowError or application crash.