In the question shown avobe a hyperlink, tag subscription, was gone as a bug. Now the hyperlink is allways hidden, appears only if you "edit" favourite tags. the developer's comment is:
I believe the thinking was that it was only relevant if you had favorite tags and it made sense to only show them if one wanted to edit the favorites
I don't agree with the developer's point of view. I liked to see all my favourite tags together in one page, were all the SE pages with the tag appeared, etc.
I think that the "advanced tag subscription", how is now called, should always be shown.