ViaBTC mining pool mines multiple blocks at same height

At height 877991, ViaBTC mined three blocks. I hadn’t seen this before.

The two alternative headers can be found here:

As of writing, we don’t have the full blocks in the stale-block dataset.

At height 912722, they mined another stale block at the same height.

In https://x.com/mononautical/status/1962890323954225299 mononaut provided this as an overview: