You may already be aware, since this is similar to issue #19, but having KubeJS enabled breaks all SilentMech alloy recipes. Could be an issue with Silents Mechanisms since it is pretty new to 1.16, but thought I'd try here first.

latest.log: https://pastebin.com/mDpJeZhJ

Lots of recipe parsing errors, e.g.:
[25Jul2020 17:00:22.577] [Render thread/ERROR] [KubeJS Server/]: Parsing error loading recipe silents_mechanisms:alloy_smelting/electrum_ingot: Silents Mechanisms alloy smelting recipe ingredient null is not a valid ingredient!

Forge: 32.0.75
SilentMechanisms-1.16.1-0.8.1+62.jar
SilentLib-1.16.1-4.7.0+58.jar
kubejs-2.7.2.49.jar (tried earlier versions also)

Thanks. I know it must feel like herding cats sometimes. 😹