Since release 1.5.0 the Wood to Copper Upgrade has stopped working due to the writeNbt method being protected from 1.18
Since release 1.5.3 the Wood to Copper Upgrade has been flagged as [WIP] and its functionality has been disabled.

As I do not have time to make a workaround for this just yet, I'd like to see if the writeNbt method will be made public again in a future Minecraft release as Mojang has changed this method multiple times in the last six months.

However, anyone is more welcome to make a Pull Request with a fix!