On sharded clusters, a $$SEARCH_META-binding aggregation silently drops one shard's entire document stream when results span multiple getMore batches. The $limit 1 stage in the meta pipeline proactively disposes its cursors after the first meta doc, which cancels the other shard's in-flight meta getMore mid-Exchange::loadNextBatch, setting an error on the shared Exchange. The doc cursor's subsequent getMore then fails with ExchangePassthrough, which the AsyncResultsMerger silently treats as clean EOF, returning a partial result with no error.