An update: I waited a considerable amount of time (many in-game days, probably greater than 7), and when I happens to stroll pass the sap catchers, I was able to use the "collect all" option but it only pulled 2-3 sap. And iirc, the 5 sap bits that were in the acorn shell were *still* there after. So it seems to me this has two issues: 1) the "collect all" feature is linked to an address that gets slowly filled over time, but the rate at which it generates is like 1/10 or less of what is intended (I hope), and 2) the sap physically displayed inside the acorn does not destroy itself when using the collect all feature....