It will likely break some things ;p NPCs walk between linked graph points and graph points won't change, so it will be possible for them to instantly teleport from Garbage to Yuzhniy which will be on the other side of map (and same with all other levels).
The global map you see in PDA is only for player, NPCs (and pretty much the rest of the game) use a different version of map which isn't shown to player.
bvcx
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