According to BlockBeats, on May 20, mempool data showed that an empty block (i.e., a block containing only one transaction, Coinbase, a block reward) was mined at Bitcoin height 844293, which was only 23 seconds away from the previous block height. Miners pack empty blocks for economic reasons, and this is the wisest choice for miners. In order to make full use of this time for mining and avoid conflicts with transactions packed in the parent block, miners cannot fill transactions into the block, which means that miners can only try to mine empty blocks.