On certain map items, most, or even all of the map is greyed out when you stick it in an item frame or just hold it. Its not all maps, just some.

Put the summary of the bug you're having here

What I expected to happen was...:
To make a map and it show me a map of the area.

What actually happened was...:
I made a map and it was mostly greyed out.

Steps to Reproduce:
1. Make a map
2. Visit chunks previously not visited before a certain update
3. Use the blank map in the chunk.