Put the summary of the bug you're having here

What I expected to happen was that when I scaled the map that the fully zoomed out map would leave me in the center of the map as has previously been the case.

What actually happened was the new fully zoomed out map generated starting from the bottom of the map and about 1/4 of the way in from the left.
I tried a second time and it generated from the top left

Steps to Reproduce:
1. Right click while holding a blank map
2. Use a crafting table to scale out the map
3. Not how the player is nowhere near the center