Hello,
My guild has recently restored the Workshop and was able to progress trough the Synthesizer upgrades. We finished the Lumber Synthesizer 3 upgrade and we saw it unlocked the level 4 one.
There is one problem we noticed regarding this newly unlocked upgrade. This upgrade unlocks Elder Wood logs as a possible gathering material from the Lumber Synthesizer node, but it requires 500 Hard Wood Planks instead of Elder Wood Planks.
Is this intended?
All other Synthesizer upgrades require the material that they will unlock for gathering (eg: Cloth Synthesizer 5 requires Bolts of Gossamer and unlocks Gossamer as a possible gather, Ore Synthesizer 4 requires Platinum Ore and unlocks Platinum etc).