When I created the album I had a few pictures that were horizontal and not vertical. I edited those that were wrong and made them vertical. It never updated on the thumbnail of the album cover, Till now.
I can replicate it here to a certain degree. I created an album with one image on its side, the thumbnail showed accordingly. I went in and edited the image so it was correctly oriented, saved it. Then went back to album and it still showed image sideways. I went and added another image (have since deleted it) and it forced the thumbnail on the album cover to correct.
I will have to try the other issue at home, and that is an image that was edited prior to uploading, and it uploaded to what it was prior to editing.
The issue in the bug report has been confirmed so we don’t need to do any further testing on that.
If you’re uploading images and some are rotated and you have EXIF functions enabled then it likely just means the photo doesn’t contain the necessary EXIF data to indicate that it is rotated. Nothing that can be done about that other than rotating the image (as you have already done).
So we just need to fix the bug that doesn’t update the album thumbnail and that should sort it.