I set up a very basic tree farm with a Lumberjack, Planter and Picker. The Picker will go get saplings and wood, but will not release them when returning to the docking station. I've tried using the filter, request items and accept items parameters.

Yes, the chest needs to be inside the defined area.\

if you are giving the picker a defined area to work in then there needs to be a chest in the area that can accept items.

that has been the way i get it to work

Unless there's more info on the issue, this should be closed as invalid.

Assuming duplicate since not seen in production.

i think i know what he means, the pickers are keeping their items sometimes, and deposit them only if their inventory is full

This could be the same as #2350