Stockpile/Industry Storage Drawing issue

[criomorph]

There appears to be an issue with workers drawing materials from production facility storage.
In particular in both my campaigns so far I've noticed that the logging camp's storage will fill up without any of the logs being used for anything - instead after that storage fills up workers will instead chop down new trees to match any needs.

Currently have a logging camp with 28 logs that nobody's using for anything, instead they trek a mile up to the logging location, pick up a felled log and drag it to the construction area. If there's no felled log the Ox will go do anything else but draw from the logging camp.

Similarly, stockpile workers won't pull logs from full lumber yards - only ones that haven't been filled up yet.

I have a sneaking suspicion it might have something to do with those logs being flagged as reserved then being ignored by workers for some reason I can't fathom. Logs from demolished buildings aren't being picked up either when Timber surplus is at 0.