The asins being displayed are the internal keys from the hash, not the actual asins. For reasons related to how PHP handles merging hashes where the keys are considered numeric to PHP, the code must ensure that the keys remain strings, or the hash gets anonymized upon merge and the keys that were previously numeric ASINs get converted to a numeric sequence, losing the ASIN mapping.
To fix, ensure that the default asins loaded from code when this field is blank strips off the ASIN_ part of the key.
Start by deleting the asins in the default list:
Click update and you'll see:
The asins being displayed are the internal keys from the hash, not the actual asins. For reasons related to how PHP handles merging hashes where the keys are considered numeric to PHP, the code must ensure that the keys remain strings, or the hash gets anonymized upon merge and the keys that were previously numeric ASINs get converted to a numeric sequence, losing the ASIN mapping.
To fix, ensure that the default asins loaded from code when this field is blank strips off the
ASIN_part of the key.