I dont think i need to explain this more. You can chisel normal wooden chest into vanilla Ender Chest.

Chisel: 2.9.3.9
InfiTech 2 Modpack

I have found out that the vanilla Ender Chest has a "chest" oredictionary tag same as wooden chest. Trying to pinpoint the mod causing this

Wasnt that hard. OpenComputers are registering Ender Chest and Vanilla Wooden Chest as chest in oreDictionary. I have asked why they are doing it. MightyPirates/OpenComputers#1528