The map background lost quality when it is constantly updated

Expected behavior
Example: When I upgrade a map by adding new cities or new borders, I expect the map background quality to stay the same.
Actual behavior
When I make upgrades to my map, the map background is gradually losing quality. I know this could be fixed by ending all the proper upgrades to the map and then one final time re-upload the original background of the map but to be honest is very annoying to see this to happen.

Steps to reproduce the behavior
Example:
1. Save new upgrades to cities or borders on any map.
2. Wait for the borders to being upograded into the map.
3. Open again the map to edit it or make a test game to see how it looks and you will see the downgrade in quality of the map background.

Here i attach evidence how gradually the map lost quality, and on the same area:

Before:


After:


Information:
Browser: Google Chrome

Browser version: 107.0.5304.107

OS: Windows 10

作者： I_Hate_You_All, 22.11.2022 at 11:30

Expected behavior
Example: When I upgrade a map by adding new cities or new borders, I expect the map background quality to stay the same.
Actual behavior
When I make upgrades to my map, the map background is gradually losing quality. I know this could be fixed by ending all the proper upgrades to the map and then one final time re-upload the original background of the map but to be honest is very annoying to see this to happen.

Steps to reproduce the behavior
Example:
1. Save new upgrades to cities or borders on any map.
2. Wait for the borders to being upograded into the map.
3. Open again the map to edit it or make a test game to see how it looks and you will see the downgrade in quality of the map background.

Here i attach evidence how gradually the map lost quality, and on the same area:

Before:


After:


Information:
Browser: Google Chrome

Browser version: 107.0.5304.107

OS: Windows 10

i have to take and major oui oui

Download the original background imagine

Reupload the background with the saved file after every save.

This problem is constant with every map in atwar
Similar thing happens on your phone after screenshotting the same photo multiple times. Not sure why it loses quality but it just does.