Right clicking cake with empty main hand does not use item in off-hand

The bug

Right clicking a cake which cannot be eaten with an item with a right click action in the main hand will correctly use the item. However, if the cake is clicked with an empty main hand and the same item in the offhand instead, the item's action is not executed. This is inconsistent with all other blocks.

How to reproduce

1. Place an item with right click ability like a fishing rod in your offhand

2. Right click a cake with an empty main hand
   → You will notice that the fishing rod is not used

Code analysis

Based on 1.11.2 decompiled using MCP 9.35 rc1 (may no longer apply given 19w42a changes)

The respective methods overriding the method net.minecraft.block.Block.onBlockActivated(World, BlockPos, IBlockState, EntityPlayer, EnumHand, EnumFacing, float, float, float) return true if the currently held item is empty.