Lightmap become invalid after import a exported package

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I created scene and baked lightmap (no light,just Ambient light in render settings and sky light in lightmapping) ,then exported it as a package.
Then I create a new project and import the package,open the scene the lightmap become invalid.

scene before export

create a new project and import the package , no lightmap

specify the lightmap manually,no effect.

clear the lightmap and rebake, something wrong…

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Well…I fixed it…
Caused by the damn Direct3D 11-checked issue…