Data error in dataset 0. what's that?

Hi forum,
I did something stupid the other day, managed to connect an external disk that was part of zpool A such that it appeared in zpool B. I realised as soon as I had done zpool status that zpool B should not have been online, but it was. I immediately switched off the machine, booted without that disk connected and destroyed zpool B. I managed to get zpool A back and all of my data appears to be there, but I have a data error which I am unable to track. Apparently it is:
DATASET 0, OBJECT a, RANGE lvl=0 blkid=0
I have found this line from output of zdb:
Dataset mos [META], ID 0, cr_txg 4, last_txg 1759562, 406M, 362 objects
Is anyone able to shed any light on where this error might be and what I might be able to do about it? I do not have a backup of this data so restoring is not an option.
Any advice appreciated.
Thanks,
Matt

Error -1 generally means a catastrophic hardware failure. You'll need to bring your phone into Apple or the authorized service provider in your country.

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