In my case I had 8 million checksum errors. The web gui showed "8". At first glance, 8 checksum errors isn't too bad. Then the horror of doing a 'zpool status' and seeing it's 8 million!
The changes made to the way data is presented must have fixed this.
I created a VM with two virtual disks in a zfs mirror. Wrote a bunch of data to the pool. Exported the pool, and corrupted a bunch of the data on one of the disks with dd. Reimported and scrubbed the pool. "zpool status" shows, for example, 41.9K checksum errors. And the gui shows 41.9K in the checksum column.
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