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An alternative chain based on Litecoin 0.8.6.1 that I have an interest in is during certain low-difficulty periods showing several blocks that contain empty TXIDs. Digging into the TXIDs return nothing with gettxout, and "No info available" with getrawtransaction. Usually these blocks contain just a single empty TXID, but some blocks can contain normal TXIDs as well as an empty one.
What's the cause of this? What action can create these empty blocks with no apparent transaction or coinbase content in them? Can it be rectified?