Large stacks placed into chests will not work correctly, and there is a potential for loss of items.

There is a workaround that I haven't had a chance to implement yet, but it only partially works. The right amount of items will be there, but the client won't see it correctly. (so 65 items will still say 64, which can lead to confusion)

Another temporary workaround would be to disallow large stacks from being put into chests so that no items that will be lost.

Chests now stack properly in the latest test version. Also capped items to 127 to prevent any loss of items when saving. (I may have a workaround for this, but not sure if it will work).