Found quite a few listings where getItemByLegacyId call returns nulls in both estimatedAvailabilities.deliveryOptions and shippingOptions.
Needles to say, if I open these listings in browser, I do get shipping options and associated costs.
API call has my proper location set, i.e. the same as in browser.
I couldn't figure out the pattern. It seems to be random.
I don't want to publish the IDs of the listings.
Hope someone from developers team would respond. Then I will provide the listing numbers.
