Store Worker Process stops and returns "System.NullReferenceExceptions" multiple times per day

Symptoms 

When a four-node database availability group (DAG) is in production in Microsoft Exchange Server 2019, the Store Worker Process stops responding. This causes the database to fail, and the mailboxes get quarantined every day. 

The process stops responding because of an unhandled System.NullReferenceExceptions exception that's generated multiple times per day.  

Resolution 

 To fix this issue, install the following security update, as appropriate:

• Description of the security update for Microsoft Exchange Server 2019: January 10, 2023 (KB5022193)

• Description of the security update for Microsoft Exchange Server 2016: January 10, 2023 (KB5022143)