Yeah it wouldn’t be too complicated to add a “hide duplicates” feature to Filtered Topic Lists, if @gormus is interested. The findFilteredTopics action could be modified to store every topic ID in a list, and then duplicates could be filtered out.
The downside is that if you want a list of 10 topics, you might only get 5 after duplicates are removed… but that could be partially avoided by maybe fetching a few extra beyond what was specified in the setting.