Description:

• Shift clicking into item pipe filters dupes the stackable item
  to fix this disable shift clicking or fix tile entity
  Steps to Reproduce:
• open item pipe filter shift click item and it wont go in instead it will dupe

Technical Information:

• Minecraft:
• Fabric API:
• Industrial Revolution:
• Modpack:

Logs:

• Use a paste service, do not paste the logs directly here.

Details:
Extra information that might be helpful like screenshots or technical information about your computer.

Thanks for reporting, fixed as of 1.9.4-BETA.