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If Session-timeout period is expired, will AP delete the PMKSA for a client?

In my network, when a wireless user is authenticated by a RADIUS server, AP receives an ACCESS ACCEPT packet with session-timeout period of 30 mins. After 30 mins, AP send De-auth to that wireless client. The same client again tries to Re-associate with AP using PMK Caching. (Client is not authentication using full 802.1x since its using PMK caching). But this time AP is not maintain any session, client stays connected even after 30 mins.

Is this expected behavior?
I thought AP will delete PMK key once the session timeout period is expired. In that case, AP should ignore the cached PMK send by the client.

Please clarify me. Thanks in advance.