The Bug:

The white markers on maps created in the nether or end dimensions don't disappear when viewing the maps in the overworld until the world is reloaded.

Steps to Reproduce:

1. Enter the nether or end and obtain a map.
2. Fill the map by right-clicking on it while it's held in your hand.
3. Look at the filled map and observe how there is a white marker used to indicate your location.
4. Enter the overworld and look at the map once again.
5. Take note as to whether or not the white markers on maps created in the nether or end dimensions don't disappear when viewing the maps in the overworld until the world is reloaded.

Observed Behavior:

The white markers don't disappear.

Expected Behavior:

The white markers would disappear.