Make the way Overworld maps work in in the Nether the same on Java as it is on Bedrock.
When you take a map into the Nether on Bedrock, as you travel, the pointer updates to show the equivalent position in the Overworld. In other words, the pointer moves 8 pixels on the 1:1 scale maps for every block traveled in the Nether. This makes things like syncing Nether portals easier even if the coordinates are off.
On Java, map pointers freeze while you are in the Nether. Even though it's easier to get coordinates in Java via the Debug screen, this doesn't give us an in-game way of judging position the way we can in Bedrock. It breaks immersion.