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The interpreted reader tracks a record aligned current position in the WAL stream. Partial reads move the stream internally, but not from the pov of the interpreted WAL reader. Hence, where new shards subscribe with a start position that matches the reader's current position, but we've also done some partial reads. This confuses the gap tracking. To make it more robust, update the current batch start to the min between the new start position and its current value. Since no record has been decoded yet (position matches), we can't have lost it