is Missing on Shard after upgrade to 3.6 from 3.4

Hi, I have upgraded my MongoDB sharded cluster from version 3.4 to 3.6 and also featureCompatibilityVersion to 3.6 but collection is missing from each shards of this cluster and creating too many local session which is not getting refreshed. This is creating connection spike and slow response time from mongoDB.

Please help me to fix this issue, what I should do now to have this collection and clear the session.