Ticket registry error

[Hartmut Trüe]

I am getting this error in CAS 6.6 when Memcached is enabled (no events enabled, no geolocation enabled):

2023-02-24 10:28:05,241 ERROR [org.apereo.cas.ticket.registry.MemcachedTicketRegistry] - <Failed adding [TGT-1-********jyd9qac-cas-dev]>
2023-02-24 10:28:05,244 ERROR [org.apereo.cas.ticket.registry.MemcachedTicketRegistry] - <com.esotericsoftware.kryo.KryoException: java.lang.IllegalArgumentException: Class is not registered: org.apereo.cas.authentication.adaptive.geo.GeoLocationRequest
Note: To register this class use: kryo.register(org.apereo.cas.authentication.adaptive.geo.GeoLocationRequest.class);
Serialization trace:
properties (org.apereo.cas.authentication.metadata.BasicCredentialMetaData)
credentials (org.apereo.cas.authentication.DefaultAuthentication)
authentication (org.apereo.cas.ticket.TicketGrantingTicketImpl)
        CasKryoTranscoder.java:encode:57
        MemcachedClient.java:asyncStore:304

        MemcachedClient.java:set:928

Is it known and is there a solution for it?