Im playing with the latest version of xtones for 1.12 and my game output is being spammed with
"Unable to read property: variant with value: sixteen for blockstate: {Properties:{variant:"sixteen"},Name:"xtones:zane"}"

I have not been able to find the reason for this.

Fixed in 1.2.2

I changed the way the blockstates were implemented without considering existing resource packs.
I will revert this change to fix the incompatibility.