I have the same problem. Less than all of my credit cards registered in LastPass show up when I right-click in a field, then select \ LastPass \ Other \. In my case twenty cards and bank accounts show up, but I have more than that registered in LP. Like the OP, I can't figure out what's different between the ones which show up and the ones which don't.
It's a shame that the thread starter post was made in April, but nobody ever replied. I've scoured this community, but don't see a solution. As a paid LP Family Subscriber, I'm supposed to get email support, but Logmein buries that so well, I can't find where / how to submit a trouble ticket. I really don't want to migrate my entire family to another platform, but the lack of meaningful support here has got me looking around.
If credit card data is not showing up in any of the new item categories, then you may need to manually complete the migration over to the current experience. See FAQ: