Ando: The Dev team is aware of the stacking problems and has been making some ongoing progress at addressing them. The first stacking issue that was fixed involved old boards that weren't stacking correctly with newer ones, which was addressed shortly after the release of Mondain's Legacy. There are plans to fix plant resources that are not automatically stacking in (although I can't make any promises this will go in for sure). I believe an issue related to arrows not stacking correctly was fixed at some point as well.

The stacking issues basically stem from a fix to legacy bug that caused items to lose their properties when stacked with other items that didn't have the same information. This was a necessary change to allow stacking of quest items to work correctly. However since this was a global change, the result is that some older items in the game are no longer stacking with newer items if they differ in any form. Unfortunately, these bugs have to be identified and fixed on a case by case basis, which is why they cannot addressed all at once without reintroducing the original bug (which we can't do because it would break quests).

Ando: To clarify, yes I believe the plan is to fix plant resources for pub38, however it is generally not a good idea to promise something before you are certain it can be delivered.