We have been exporting old products with lots of children and importing them with changes as needed, which has been great. It would be helpful if we could read the import logs to find issues though, but usually we can spot a typo or incorrect field and fix it.
However we have a product with many children, and we are just getting stuck on the 10th set of options in the custom_ordering column. We are using option~size, and after importing we notice the last child product in the 9th option does not show in the front end as selectable, and then none of the 10th set of options show. It is really frustrating because I can't see a typo in the import file, and I can't see what the issue is in the import log either

Everything imports correctly up until the last child in the 9th option.
BC Grey Frame Oxide Ring BCFOT 8/2.8 mm shows, but the last 8/3.0 mm, and then none of the 10th option CC Silver Frame Oxide Ring CCFOT shows at all in the front end of the website when previewing the product.
Is it possible the 10th option causes a bug?? I doubt it but I cannot see what I am doing wrong either.
Many thanks,
Aaron