As it turns out, .psk file format just doesn't have the capability of holding vertex normals. Exporting models as glTF format however, does retain normals. It's a completely different file format though and it's unsupported and there is very little information about it. But in my testing, I believe this can export Morphed normals data correctly.     umodel_morph_fix2.zip   - Source code is now based on (forked from) May 6, 2020 revision of the main repository.
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