Eating Pufferfish in a stack of 1 does not give debuffs

Eating a singular unstacked pufferfish does not inflict any debuffs on the player. (tested in singleplayer)

https://www.youtube.com/watch?v=I2CRCcnRcQI

Code analysis

Based on 1.11 decompiled using MCP 9.35 rc1

The problem is that the stack size is decreased (net.minecraft.item.ItemFood.onItemUseFinish(ItemStack, World, EntityLivingBase)) before other methods are called, in particular net.minecraft.item.ItemFishFood.FishType.byItemStack(ItemStack) which calls the method net.minecraft.item.ItemStack.getItem() which returns air because the count is 0.

This is a general problem and affects multiple items. Luckily they don't call methods which require a valid item at the moment.