Zpool Scrub Status "% Done" reports over 100% done. (Doc ID 2632246.1)

Example:

    (extracted from 'zpool status pool1')

# ./CHECK_SCRUB_STATUS
pool01
Wed Oct 23 15:53:26 EDT 2019
scan: scrub in progress since Wed Oct 23 15:05:01 2019
1.14T scanned out of 8.69T at 412M/s, 5h20m to go
0 repaired, 13.13% done
Wed Oct 23 15:58:26 EDT 2019
scan: scrub in progress since Wed Oct 23 15:05:01 2019
1.27T scanned out of 8.69T at 417M/s, 5h10m to go
0 repaired, 14.67% done
...

Wed Oct 23 18:58:33 EDT 2019
scan: scrub in progress since Wed Oct 23 15:05:01 2019
7.32T scanned out of 8.69T at 459M/s, 0h52m to go
0 repaired, 84.26% done
...

Wed Oct 23 19:48:33 EDT 2019
scan: scrub in progress since Wed Oct 23 15:05:01 2019
9.35T scanned out of 8.69T at 431M/s, (scan is slow, no estimated time)
0 repaired, 107.64% done
...

Wed Oct 23 20:58:35 EDT 2019
scan: scrub in progress since Wed Oct 23 15:05:01 2019
16.0T scanned out of 8.69T at 377M/s, (scan is slow, no estimated time)
0 repaired, 184.41% done
...
Wed Oct 23 21:59:52 EDT 2019
scan: scrub in progress since Wed Oct 23 15:05:01 2019
23.2T scanned out of 8.69T at 335M/s, (scan is slow, no estimated time)
0 repaired, 267.29% done
...

Wed Oct 23 23:34:54 EDT 2019
scan: scrub in progress since Wed Oct 23 15:05:01 2019
42.4T scanned out of 8.69T at 298M/s, (scan is slow, no estimated time)
0 repaired, 488.21% done
Wed Oct 23 23:39:54 EDT 2019
scan: scrub repaired 0 in 8h34m with 0 errors on Wed Oct 23 23:39:36 2019

The worst one seen was:

" 0 repaired, 9143.73% done"

Both SPARC and X86 servers show this issue.