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Fixes #7084
The problem was a tile referencing an external tileset would pass the visibility test but it's child, the root of the external tileset, would not due to the
cullWithChildrenBounds
optimization. This is why #7084 could only be replicated in views where the root's children were all off screen. The external tileset would not refine further and would select its nearest loaded ancestor, causing the tileset to render mixed LODs.The fix is to use the root tile's visibility in place of its parent's visibility so that the traversal never gets to the parent tile in the first place.
To do: