Thank you very much for taking your time to test this. It turned out changing all the affected products to drafts and re-publishing them seems to have fixed the problem. So strange!!!
Hi, yes I have done that. However may I please request you test from making the coupon in the vendor frontend dashboard? That is my problem. Thank you.
Hi, yes I know. Just suggesting that if this were standard, it would fix a very common gap in understanding how the suborders work and get rid of a lot of confusion for customers.