Normal Map wont keep alpha after saving package

polycounter lvl 6
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Macattackk polycounter lvl 6
I have a normal map with a height map in the alpha channel for a bump offset. when I import or reimport the normal map, it uses the alpha channel height map correctly. Although, every time I save the package, it gets rid of the height map in the alpha channel which gets rid of the bump offset. how can I have the normal map permanently keep the height map?

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