Bitcoin mined an empty block at height 847904

Mempool data shows that miners mined an empty block (i.e., the block only contains one transaction of block reward Coinbase) at Bitcoin height 847904, which is only 29 seconds away from the previous block height. It is reported that miners pack empty blocks for economic reasons, which 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.