ZFS Single drive pool resilvering after power failure

Had an external drive plug pack fall out of a power board.

There are some bad sectors reported by smartctl. ZFS reports 1 known data error, but it's also reporting that the pool is currently resilvering.

I can understand a scrub, but why would a pool with a single drive - and that's all it has ever had - be resilvering?

Code:
  pool: localsync
 state: ONLINE
status: One or more devices is currently being resilvered.  The pool will
        continue to function, possibly in a degraded state.
action: Wait for the resilver to complete.
  scan: resilver in progress since Sun Feb 28 18:14:10 2021
        556M scanned at 12.1M/s, 687M issued at 14.9M/s, 6.20T total
        0 resilvered, 0.01% done, 5 days 00:59:49 to go
config:

        NAME        STATE     READ WRITE CKSUM
        localsync   ONLINE      12     0    12
          ada0.eli  ONLINE      12     0    25

errors: 1 data errors, use '-v' for a list
 
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