I am on the Huawei Honor 6x. When in a crafting table or in the inventory, if you can make magenta dye with pink and purple dye, it will show you that you can make 99+ magenta dyes even though you might not be able to. Crafting the amount of resources for the magenta dye, will show you that you don't have the resources for it, which is supposed to happen. When you have the resources again, the bug occurs again. Have a good day!