session.server.landinguri not found in variables

I wasn't sure if is really any case that has that variable. However, even a network access with edge client shows that, so I guess is all accesses.

[root@LABBIGIP1:Standby:Changes Pending] local  sessiondump --sid b860e3d3 | grep session.server.landinguri
b860e3d3.session.server.landinguri 1 /
[root@LABBIGIP1:Standby:Changes Pending] local 

Do you see the variable using the sessiondump as in the example above?

Apparently it is being added to cache. The scenario is idp selection is made off of session.server.landinguri . Upon the IdP returning the assertion an iRule must then make another decision based on the returned uri.

Feb 9 08:12:54 bigip-ve1 debug apmd[12944]: 01490000:7: ./AccessPolicyProcessor/Session.h func: "getSessionVar()" line: 571 Msg: variable found, lets add it to the local cache "session.server.landinguri"="/myexampleuri"(length=39) Feb 9 08:13:38 bigip-ve1 debug apmd[12944]: 01490000:7: ./AccessPolicyProcessor/Session.h func: "getSessionVar()" line: 542 Msg: variable "session.server.landinguri" was not found in the local cache for session "c7b2fd89"

Now I am very confused. When watching active sessions I see 2. One that shows my initial login attempt and the 2nd with the SAML assertion from the IdP. However, later when going to all sessions I see 1 that does not contain session.server.landinguri . The sessions above and below have nothing to do with this login attempt.