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A hardcoded WGS84 projection does not match the ellipsoid the host stores, so stacking this overlay with another geographic overlay creates a third texture-coordinate set and crashes.
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Summary
Vector tiles built their projection from a hardcoded WGS84 ellipsoid. The ellipsoid Unreal stores is slightly different, so this overlay plus a GeoJSON overlay becomes a third projection. The texture coordinate id goes to 2 and the editor crashes.
I changed the vector-tiles overlay to use the ellipsoid from the overlay options.
Test plan