[Not my answer!][1] But since this was asked 4 days ago and I was curious too about this, here's what I found.

> Miners mine empty blocks during the time it takes them to download new transactions, which is circa 100ms. If they happen to find a valid block during that time, they broadcast it to the network, collecting base reward.

They won't get transactions fees but will still get a block reward.

Update:

It could be a vanity block, maybe. This is a block where someone pays a higher fee than any txs fees, just to claim the ownership of that block.

Here's an interesting [thread on Reddit][2] where they talk about this and expose one of such vanity blocks.

This is [the block][3], it has just 1 tx and is just a few hours apart from the block of the OP. The [tweet][4] announcing the ownership of that block, lol.

  [1]: https://www.reddit.com/r/ethereum/comments/oygsv5/comment/h7u8kme/?utm_source=share&utm_medium=web2x&context=3
  [2]: https://www.reddit.com/r/ethstaker/comments/xpcv1o/comment/iq3ostb/?utm_source=share&utm_medium=web2x&context=3
  [3]: https://etherscan.io/block/15598565
  [4]: https://twitter.com/MevRefund/status/1573416023998578703