I don't understand the pool software or the specific problem so all I can do is speculate.

Under normal circumstances you know every miner's share percentage, the miner that solves a block and
whether it was shared, solo or party mode.

After recovering from the wallet lockup you are able to distribute the block but not able to identify the miner
that solved it. That suggests that the share percentage of each miner is still available but the other data was lost
in the reboot. It should be possible to ensure all the data survives.