Um, 12 was greater than 11 when I went to scool (sic)
My guess is the "-build" is causing a problem

Edit - sorry forgot this info
MC version 1.16.5
Forge 36.0.1
kubejs-1605.3.5-build.155-forge
rhino-1.7.13-build.12

Might be the new Common Core Math they're using.

Should be fixed by now