On September 12, according to mempool data, miners mined an empty block at bitcoin height 860932 (that is, the block only contains a block reward Coinbase transaction), which is only 20 seconds away from the previous block height. Miners pack empty blocks for economic reasons, and this is the smartest choice for miners. In order to make the most of this time for mining and avoid conflicts with the transactions packaged in the parent block, miners cannot fill the block with transactions, which means that miners can only try to empty the block.