"Default" license
I'm not sure if I'm right, but... the problem happens for me when we do not allow user to select license, but we want to have default one for all entries. So, there is one license selected in the field configuration, like on the attached image.
I suppose it should always show attached license when the file is downloaded on the front-end, however seems like it is skipped... one note seems like it behaves also in such way with previous field version...