Creating or updating maps result in them getting random stripes in worlds made before the 1.16 snapshots, it usually happens on world generated terrain and not on user made structure likes its shown on the screenshot.
To reproduce open the world and update one of the maps
World with the issue: https://drive.google.com/file/d/1mjAMK0-M1fjDXzPahNPa0LQAsmsjRkR2/view?usp=sharing
- duplicates
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MC-179858 Maps show stone-like pattern despite it not being there
- Resolved