That is a cosmetic issue, they will not lose their value. level 3 is hoard and 4 is trove.
Old level, yes. Now, they go from 0 to 4:
0: Stash
1: Supply
2: Cache:
3: Hoard
4: Trove
Code:public enum TreasureLevel { Stash, Supply, Cache, Hoard, Trove }
enums always start at 0 unless you define the first in the list.