Weird bug don't let me edit an old map

Bug Report

Expected behavior
When I edit the borders of the map GGG Part 4: Alternate 7 Years War i expect to fully edit them without any problem.

Actual behavior
When I try to edit any border on this map, i get this weird bug:



Steps to reproduce the behavior
1. Open GGG Part 4: Alternate 7 Years War and try to edit any border
2. The weird message will show.

Information:
Browser: Google Chrome
Browser version: 108.0.5359.125

Any other relevant information: This is an old map and even if i clone it, it will show that error.