I have over 100 albums stored as favourites. Is the plugin still limited to showing just the first 50 albums?
yes, limited by 50 items, due to spotify API, maximum limit of single request. If need fetch more - need to use pagination dealing with rate limits which prevent you from fetching too much data at the same time.
In my fork I managed to implement this logic and it is loading full list of tracks, albums and artists.
I haven’t not rebased my fork onto latest plugin v4 yet.