Switching Lumberjacks to Farms

Hey Guys,

I am watching a youtube video from Hera right now. It looks like when he sends vills to straggler trees, he doesn't have them return the wood they collected before making a farm. Doesn't this mean that any wood they chopped is wasted? I am around 1100-1150 ELO and I always will send my vil to the TC to drop off the wood before making a farm.

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If I am making a mistake please let me know.