I don't think this is a level lock situation. You unlock the
Berrygarden at level 8 and it'd make no sense keeping the item and
berry bags locked past level 30.
Were you able to see the item and berry bags before the new update?
Could this be a bug?
I think (it's been a while since I implemented the garden)
you unlock this functionality during your berrygarden tutorial
(which you haven't finished yet, based on the fact that the Berry
market and Bulletin board are still locked for you).