Hangfire: Cannot insert duplicate key in object 'HangFire.Counter'

I was using a single deployment/server previously, Now aster shifting to an IIS Cluster with three servers, getting this exception a lot, jobs are not completing.

Violation of PRIMARY KEY constraint 'PK_Counter'. Cannot insert duplicate key in object 'HangFire.Counter'. The duplicate key value is (stats: succeeded).

Using: hangfire 1.7.9

No file, test, or entry point is named. Start by reproducing the duplicate-key exception with the three-server IIS deployment and inspect the Hangfire counter persistence path and the reported stats:succeeded key. Done means clustered processing no longer produces the exception and jobs complete reliably.

Written by the indexing model from the issue text.