When I generate a new subalbum and upload some images there, the first picture does not have a title and date, while all the others have it. Since the first entry is used as the date for the entire album, it does not have it. I am using the most recent nightly build.

You can manually set the album date. It is deliberate that the first image is used for the default. That works most of the time, just not in circumstances like you have.

I dont see any reason, why you dont assume at least its title. It's also more convenient, if albums get the date of the upload automatically.