SERVER-99545 introduced Operation FCV (OFCV, VersionContext), an FCV snapshot to an operation.

As initially introduced, an OFCV was always owned by a resilient distributed operation (ShardingDDLCoordinator), and was propagated across shards (global scope).
To safely use OFCV for replica set operations (a local, non-persisted OperationContext) we need to tag it with local scope instead.

The differences are:

• A global OFCV is propagated across shards (SERVER-99557 / SERVER-99558), while a local OFCV is not.
• A local OFCV may be used in FCV <8.2 as an in-memory state on primaries, not replicated through the oplog. On the On the other hand a global FCV can only be used in FCV ≥8.2 (due to ShardingDDLCoordinators requiring persistence).

The scope is only held in-memory, i.e. not persisted when serialized.
By default it is local, and it's set to "global" by ShardingDDLCoordinator, and also when propagated across shards.