Issue in Redis Session Serialization after Upgrading from Spring Boot 3.3.3 to 3.4.3

Description:
Hello :)
After upgrading from Spring Boot 3.3.3 to 3.4.3, my application encounters an issue where certain sessions stored in Redis no longer include the creationTime attribute. This results in a persistent exception being thrown during request handling:

Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception
java.lang.IllegalStateException: creationTime key must not be null
	at org.springframework.session.data.redis.RedisSessionMapper.handleMissingKey(RedisSessionMapper.java:62)
	at org.springframework.session.data.redis.RedisSessionMapper.apply(RedisSessionMapper.java:72)
	at org.springframework.session.data.redis.RedisSessionMapper.apply(RedisSessionMapper.java:37)
	at org.springframework.session.data.redis.RedisIndexedSessionRepository.getSession(RedisIndexedSessionRepository.java:535)
	at org.springframework.session.data.redis.RedisIndexedSessionRepository.findById(RedisIndexedSessionRepository.java:500)
	at org.springframework.session.data.redis.RedisIndexedSessionRepository.findById(RedisIndexedSessionRepository.java:267)
	at org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.getRequestedSession(SessionRepositoryFilter.java:352)
	at org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.getSession(SessionRepositoryFilter.java:286)
	at org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.getSession(SessionRepositoryFilter.java:193)
	at jakarta.servlet.http.HttpServletRequestWrapper.getSession(HttpServletRequestWrapper.java:221)
	at org.springframework.security.web.context.HttpSessionSecurityContextRepository.lambda$loadDeferredContext$0(HttpSessionSecurityContextRepository.java:143)
	at org.springframework.security.web.context.SupplierDeferredSecurityContext.init(SupplierDeferredSecurityContext.java:67)
	at org.springframework.security.web.context.SupplierDeferredSecurityContext.get(SupplierDeferredSecurityContext.java:52)

Steps to Reproduce:

Use Spring Boot 3.4.3 with Spring Session Data Redis.

Upgrade from Spring Boot 3.3.3 to 3.4.3.

Start the application and attempt to retrieve a session from Redis.

Observe the IllegalStateException: creationTime key must not be null error.

Expected Behavior:

The session should be deserialized correctly, retaining all required attributes, including creationTime.

Actual Behavior:

Some sessions retrieved from Redis do not contain creationTime, leading to an IllegalStateException.

Workaround:

No known workaround at this time. Clearing Redis storage does not resolve the issue permanently.

Environment:

Spring Boot Version: 3.4.3

Spring Data Session Version: 3.4.2

Java Version: 17

Any additional dependencies or configurations that might be relevant.

Additional Context:

This issue was not present in Spring Boot 3.3.3.

The problem appears to be related to session serialization/deserialization changes in Redis.

Would appreciate any guidance on resolving this issue. Thanks!

Start with RedisSessionMapper.java around handleMissingKey and apply, then trace RedisIndexedSessionRepository.getSession and findById from the reported stack trace. Reproduce the upgrade from Spring Boot 3.3.3 to 3.4.3 using Spring Session Data Redis and inspect affected Redis sessions. Done means sessions containing the required creationTime attribute deserialize successfully without the IllegalStateException.