You can see that blocks which come from other mods can convert into the GT6 blocks normally in the GUI of chisel. [2022-02-05_11.56.01] [2022-02-05_11.56.03] But if you interact with the blocks which come form other mods directly by using the left click of Chisel, you will get an abnormal GT6 …

Oh gawd I just looked at that API class more closely, he is seriously iterating over a HashSet… Anyways, this Cardboard Box Issue should be fixed soon. ^^