getSelfShardId() in shard_server_catalog_cache_loader.cpp uses a hard invariant to assert that ShardingState is enabled.

Due to a race window in initializeFromShardIdentity() between _initFunc() (which makes Grid::isInitialized() true) and setRecoveryCompleted() (which makes ShardingState::enabled() true), any concurrent thread that accesses the CatalogCache during this window will hit this invariant and crash the node.

Downgrading to tassert prevents a hard crash while still surfacing the error, allowing callers to handle it gracefully.