SPM-4532 introduced proactive view resolution such that mongos has all view information. As a part of that, a shard, when resolving views, might talk to the primary shard via a shardvsrResolveView command. This command CANNOT run during a transaction, due to router locks.

This was solved by just skipping proactive view resolution for transactions since extensions and mongot are not allowed in transactions, however we should eventually support this model for views in transactions.