ValidationContext is lost unexpectedly causing InResponseTo validation to fail

[tyler555g]

Describe the bug
ValidationContext is lost unexpectedly causing InResponseTo validation to fail

To Reproduce
Set a breakpoint here:
https://github.com/tyler555g/SpringSecuritySAMLPOC/blob/main/src/main/java/com/SpringSecuritySSOPOC/saml/config/Saml2LoginSecurityConfig.java#L162
Run backend. Create a login call. Wait for a couple minutes. Create another login call. Login call occasionally loses ValidationContext. See logs attached and working code example.

Expected behavior
InResponseTo validation passes correctly

Sample
https://github.com/tyler555g/SpringSecuritySAMLPOC/blob/main/src/main/java/com/SpringSecuritySSOPOC/saml/config/Saml2LoginSecurityConfig.java#L162
SpringSecurityLogsNoResponseTo20250109.txt

Log snippets:

2025-01-09T14:53:11.642-05:00 TRACE 29112 --- [nio-8091-exec-5] o.o.s.s.a.SAML20AssertionValidator : SAML 2 Assertion ValidationContext - static parameters: {saml2.ValidIssuers=[redacted], saml2.SubjectConfirmation.ValidInResponseTo=null, saml2.ClockSkew=PT5M, saml2.Conditions.ValidAudiences=[http://localhost:8091/saml2/service-provider-metadata/azure-ad], saml2.SubjectConfirmation.ValidRecipients=[http://localhost:8091/login/saml2/sso/azure-ad]}
2025-01-09T14:53:11.642-05:00 TRACE 29112 --- [nio-8091-exec-5] o.o.s.s.a.SAML20AssertionValidator : SAML 2 Assertion ValidationContext - dynamic parameters: {}
2025-01-09T14:53:11.642-05:00 DEBUG 29112 --- [nio-8091-exec-5] o.o.s.s.a.SAML20AssertionValidator : Evaluating Assertion Issuer of : redacted
2025-01-09T14:53:11.642-05:00 DEBUG 29112 --- [nio-8091-exec-5] o.o.s.s.a.SAML20AssertionValidator : Matched valid issuer: redacted
2025-01-09T14:53:11.642-05:00 DEBUG 29112 --- [nio-8091-exec-5] o.o.s.s.a.SAML20AssertionValidator : No Conditions were indicated as required
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