Unknown Block Remover

Here's a problem nobody talks about: you install an addon, build a bunch of stuff with its blocks, then decide you don't want the addon anymore. You remove it. The blocks stay. Not as air — as question marks. Grim little reminders of your past decisions, scattered across your world, completely harmless but absolutely infuriating to look at.

Unknown Block Remover is the janitor you never knew you needed. Run a discovery scan near the offending blocks and it identifies every orphaned namespace in the area — so you can see exactly which uninstalled addon is responsible. Run it in multiple locations to build up the full picture, since results accumulate between scans.

Once you've found your culprits, head to the configure screen, toggle on the namespaces you want gone, set your scan radius and interval, and enable automatic scanning. The addon will then quietly work through the area around you, replacing orphaned blocks with air on a schedule. Action bar pulses confirm each sweep. When the job's done, turn it off and forget it exists.

The whole thing is admin-only — requires GameDirectors permission, and cheats don't even need to be enabled. Settings and discovered namespaces are stored per-admin, so multiple operators can each maintain their own independent cleanup configurations without stepping on each other.

Features

Discovers orphaned block namespaces from uninstalled addons
Results accumulate across multiple discovery scans
Multi-namespace targeting — toggle each addon namespace independently
Automatic periodic scanning with configurable interval (5–60 seconds)
Configurable scan radius (8–64 blocks)
Correct dimension Y bounds (Overworld, Nether, End)
Action bar pulse confirms each scan
Per-admin settings — each operator maintains their own config
Admin-only access via /ubr:open (GameDirectors permission)
Cheats not required
Achievement-friendly
No Beta APIs required

How to Use

Step 1 — Discover

Stand near the unknown (question mark) blocks and open /ubr:open. Tap Scan for Unknown Blocks. The addon scans the area and records every non-minecraft namespace it finds. Run the scan in multiple areas to build up the full list — results are cumulative.

Step 2 — Configure

Tap Configure to open the settings screen. Each discovered namespace appears as a toggle — enable the ones you want to remove. Set your preferred scan interval and radius, then toggle Scan and remove blocks automatically on.

Step 3 — Done

The addon will now periodically scan the area around you and replace any matching blocks with air. When all the orphaned blocks are gone, simply disable scanning or clear the list.

Installation

Download the .mcpack file
Open it with Minecraft to import automatically
Create or edit a world and add the Unknown Block Remover Behavior Pack
No Beta APIs required!
Enter the world and use /ubr:open to open the panel