Attached is a picture to recreate the setup.

In synopsis:

• In previous versions, the pumpkin items will go to the side on top of the stems.

• However, most items are traveling through the blocks all the way on top of the where the redstone dust is

Blocks in picture.

• Glass is needed for light to penetrate for stems.
• Grass can be any solid block.
• Also the extra glass blocks is to prevent the broken pumpkin blocks are going to the side.