Issue: When giving a player a filled_map with a set target in the Decorations field of the NBT, the xCenter and zCenter fields of the map_0.dat structure are not set correctly, resulting in a map that doesn't work properly.

Scenario: Give a player an Ocean Explorer Map given the Coordinates of the Monument

Steps to Reproduce:

1. Open the Minecraft 1.14.4 Client
2. Create a New World, with Cheats ON and give it the Seed of Map Test.
3. Login to the newly created world
4. Change to creative mode with the following command:

   /gamemode creative
   

1. Find the location of the nearest Ocean Monument with the following command:

   /locate Monument
   

1. The Ocean Monument should be located at [272, ~, -256]
2. Give the player (tester1) an Ocean Monument filled map with the following command:

   /give tester1 minecraft:filled_map{display:{Name:'{"translate":"filled_map.monument"}',MapColor:3830373},Decorations:[\{id:"+",type:9b,x:272.0d,z:-256.0d}]} 1
   

1. This will give the player an Ocean Explorer Map
2. Save the game and exit out
3. Open up the map_0.dat file under the minecraft folder such as .minecraft/saves/New World/data/map_0.dat using an NBT editor.
4. Look at the entries under the data compound tag xCenter and zCenter.  These values will be -576 and 448 accordingly.
   
5. These values don't represent the location set in the Decorations for the Ocean Monument, nor the value of the location of the player when generating the map.

Expectations: When the player uses the /give command to give any player a filled_map and the NBT is supplied for the item that includes Decorations that specify the x and z coordinates, the map should be created with a center based on those x and z coordinates.