Addon: Chunks Are Random
Author: BebuPlayz
Chunks Are Random transforms terrain into a patchwork of randomized block areas. Neighboring chunks can become very different environments, turning ordinary gathering, travel and survival into an unpredictable challenge.

Exploration
Adapt to the resources and obstacles of each area instead of relying on the usual terrain pattern. A new world or unexplored territory gives the clearest experience of the transformation. Keep a backup before enabling terrain-changing content in a world you want to preserve.

Important: dropped item cleanup
Version 3.0 automatically deletes all items lying on the ground every two minutes. A warning appears ten seconds before cleanup. Pick up mined resources and dropped equipment promptly, and do not use loose items on the ground as storage.

Automatic cleanup affects dropped items regardless of whether they came from mining, manual dropping or another source. The ten-second warning is a final opportunity to collect them. Store supplies in containers rather than leaving piles of resources beside a work area.
For Minecraft 26.50
How to install the add-on
Download the .mcaddon or .mcpack file, open it with Minecraft and wait for the import to finish. Then enable the resource and behavior packs in the world settings. If the add-on requires experiments, turn them on before launching the world.