Tilemap failed to render

Unity Engine
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This usually happens due to rendering or package changes between Unity versions.
First thing:

  1. Check whether your tilemap Renderer or Grid settings changed in Unity 6.5 alpha—sometimes the material or sorting layer resets.
  2. Also verify that the 2D tilemap/2D Sprite packages are properly installed and updated in the new version.
    If you’re using URP, make sure the correct render pipeline asset is assigned, because missing or incompatible shaders can cause tilemap to not render.
    Lastly, try reimporting the assets or opening the scene in a clean project to rule out migration issues.