Adding new SKUs (in options) and replacing existing SKUs in Visual Merchandizer > Hero Products, disassociates the existing Hero product SKUs from the respective category.
Steps to reproduce:
1) Go to Visual Merchandizer > Hero Products and add SKUs to "Hero Products"("Only include products matched by rules " is set to "No") and then save
2) Now delete these SKUs from Visual Merchandizer > Hero Products and add other SKUs to "Hero Products"("Only include products matched by rules " is set to "No") and save.
It is observed that the SKUs added in step 1 gets completely dissociated from the respective category(rather than just getting removed from the hero products list)
Magento Enterprise Edition 1.14.2.4