Hello. This problem is similar to this https://stackideas.com/forums/can-t-see-photo-s-comment-in-stream#reply-467638 but happens with album.

1) User1 upload few (more than 1) photos to Group's album (not default story album).
2) User2 open one of this album and comment it
Result 1: in DASHBOARD we can see stream item: Album + comment below as expected (and inside album too).
Result 2: in GROUPS TIMELINE we can see stream item: Album and no any comment below.

Thanks.