This addon requires NO experiments to use and works on realms.

Dupe Patcher Pro is a free minecraft addon that patches all public-known realm/server dupes without removing bundles by blocking bundles from being placed inside of the following containers:

• Hoppers
• Droppers
• Dispensers

These containers and toggleable with the "Anti Dupe Menu" item (appears as a bundle with a red cross over it) which can be obtained through the creative menu and has the following sections on use (obtained in creative and can only be used by players with operator access):

• Reports
• Settings
• Rescan hoppers near me

Here's what each section does:

Reports: Reports contain a list of all the recent attempts made to put bundles inside any container that they are banned from, which contain the offenders name and the time of the offence in UTC. Reports disappear after 48 hours and can manually be deleted in the menu.

Settings: Settings allow you to edit which containers bundles can be placed in. By default, the only safe containers are barrels, chests, trapped chests, shulker boxes, enderchests and crafters. All other containers block bundle entry and flag up attempts to an admin. All containers can be toggled e.g. if you want to block crafters and unblock hoppers, there is a flick switch for each in the settings tab in the menu tool.

Rescan Hoppers near me: This scans each hopper in your render distance to ensure it is listed for bundle blockage as pre generated (in trial chambers) non-player placed hoppers do not automatically block bundles BUT luckily there is no known dupe with a downwards facing hopper (to my knowledge) which is how naturally generated hoppers spawn. Just incase a dupe if discovered using downwards facing hoppers, using this feature will enlist all hoppers loaded to block bundles.

Feel free to use this addon on your bedrock realm/server to stop duping without banning bundles!

Curseforge: https://www.curseforge.com/minecraft-bedrock/addons/dupe-patcher-pro