I found a warning in my logs, so I created a issue:
spring-projects/spring-security#10211

jgrandja closed my issue with this explanation:
This issue should be logged in Spring Framework since GenericTypeAwarePropertyDescriptor exists there and is the one logging the warning message.
However, I don't see this as an issue. If you want to suppress this warning message you could configure the logging framework to suppress that specific message or all logs in that class.

I think this should be fixed in spring-security, since your GenericTypeAwarePropertyDescriptor just logs similar looking methods, which could be a problem. In this case it is no problem since both methods with the name setLogoutHandlers have similar parameters, but doing the same, at least now.

11:54:01,463 WARN org.springframework.beans.GenericTypeAwarePropertyDescriptor [GenericTypeAwarePropertyDescriptor.java:141] - Invalid JavaBean property 'logoutHandlers' being accessed! Ambiguous write methods found next to actually used [public void org.springframework.security.web.session.ConcurrentSessionFilter.setLogoutHandlers(org.springframework.security.web.authentication.logout.LogoutHandler[])]: [public void org.springframework.security.web.session.ConcurrentSessionFilter.setLogoutHandlers(java.util.List)]

Affects:
Spring: 5.3.6
Spring-Security: 5.4.6