All maps I find are damaged around 60-70% (in chest, dropped by mobs or bought from traders) also newly copied ones are created with around 60-70% durability as well.
#Maps found damaged
maiden summit
tepid spindle
This is all intentional afaik
The only part I'm not sure about is the newly copied ones
maiden summit
Found ones are fine I could even accept other items to be slightly damaged when found in caves or chests.
The newly copied one is strange though.
tepid spindle
It's because internally the way it makes a newly copied map item is identical to the way it makes a map item anywhere else. It's basically just making a generic map item and then hooking it up to the same internal map