Summary:
Try to make a berry bush grow up to the last stage using a debug stick. This will work for the first few stages, but the last stage can never be reached (unless you use shift to backpropagate), instead it picks the bush with the debug stick. It should ALWAYS perform the debug stick operation while holding one. if you really so badly wanna pick that berry bush, just use an empty hand or something else. In general, debug stick should always do it's debugsticking magic and never any 'normal' operations.
Steps to Reproduce:
Put sweet berry bush down in early stage get a debug stick and right click it many times.
Observed Results:
Observe the berries you will pick instead of growing the bush.
Expected Results:
Debug stick should always use its block state magic changing behavior, and never the right click ability of whatever block. Note however that it should still be possible to add this stick into an item frame (since on java, item frames aren't blocks anyway) Just ensure that there are no other blocks that would have such "insert" behavior.
Can confirm. Also a problem with almost all interactive blocks (like chests and furnaces).