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I just realized, after unwillingly building 1400 steel chests plus 2100 smart chests that requester chest content does not figure in the logistic system storage inventory. Thus a smart inserter with logistic network condition ignores the content of requester chests.
I had a smart inserter with this condition : Unloading my smart chest assembly machine into this requester chest : It obviously didn't stop at 50
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Don't know if it's a bug, or if it works as intended, but it's really misleading. I have searched the wiki, the forum, but found no mention of that particularity. I have been trying to figure why I couldn't get my smart inserters to stop inserting for literally hours over several days, and was struck quite suddenly by the idea.
If you want, I can upload my savegame, but I guess it should be very easily reproducible : put a requester chest, a random chest with stuff you don't have in your logistic network, a smart inserter, filter on the item count for the logistic network, and watch the smart inserter be not so smart

N.B. : My chests are in the reach of roboports forming a logistic network all around, and replacing the requester chest by any other type of logistic chest "resolves" theproblem ... but can't request anything with a provider chest or a storage chest.