I found this bug when i was making anothere map "World of Steam Subscribers. Change 5" i founded that when i try to upload new map to steam.
First map in paintmode brokes after clicking on button "Upload" and map (exept of current changes) refreshes and brokes borders.
Second map just don't upload to steam! I tries it several times but it didn't work.

If developer read this i just want paintmode that was at previos version because it works normaly.

With hope
Developer of "World of Steam Subscribers" map
Alchemist5588