With the recent introduction of the limit of 100 synced downstream bases per upstream base, we realise that one of our bases has over 200 such downstream synced bases, exceeding the limit. So we receive the error "The source application has reached the maximum allowable number of synced targets". Many of these downstream bases show as unknown, with unknown creators.
My question is, how do we remove (not just disconnect, as this reportedly still counts towards the limit) the unknown bases from the upstream base? Bonus points if this can be achieved without breaking the syncs to the wanted downstream bases.