Shovel from Tinker's Construct in the offhand causes Khndrel Keght spawn

[psxlover]

When using Tinker's Construct tools, it is possible to have one tool on the offhand and another in the main hand e.g having a shovel on the offhand and a pickaxe or a sword on the main hand.

EnderZoo seems to only check what is equipped on the main hand, which results in Khndrel Keght being spawned when the shovel is on the offhand, which is annoying with the high spawn rate of Khndrel Keght.
Also it can be exploited to farm Clay!