map_tracking_position tag of filled maps is not read when map_scale_direction is provided

The following is based on a decompiled version of Minecraft 1.10 using MCP 9.30.

The bug

The tag map_tracking_position is not read from a filled_map if the tag map_scale_direction is provided. This is kind of strange because they don't preclude each other. The value of map_scale_direction is added to the scale and map_tracking_position determines whether or not a marker for the player should be added to the map and updated.

Affected method: net.minecraft.item.ItemMap.onCreated(ItemStack, World, EntityPlayer)

How to reproduce

1. Use the following command

   /give @p filled_map 1 32767
   

2. Look at the map, its scale should be 3/4 and it should not show your position
3. Replace "###" with the data value of the map you just gave you

   /setblock ~ ~ ~ furnace default replace {Items:[{Slot:2b,id:"filled_map",Count:1b,Damage:###s,tag:{map_scale_direction:1,map_tracking_position:1b}}]}
   

4. Look at the map
   → You will see that only map_scale_direction changed the map (3/4 scale became 4/4) scale

To prove that the map_tracking_position tag works:

1. Use the following command

   /give @p filled_map 1 32767
   

2. Look at the map, its scale should be 3/4 and it should not show your position
3. Replace "###" with the data value of the map you just gave you

   /setblock ~ ~ ~ furnace default replace {Items:[{Slot:2b,id:"filled_map",Count:1b,Damage:###s,tag:{map_tracking_position:1b}}]}
   

4. Look at the map
   → The map tracks now your position