Sadly due to the nature of the migration from links to graph store, it was not technically feasible to do a seamless migration. Instead, the latest OTA has moved all the link collections into graph-store, as archived graphs. As links now uses a client-server topology, groups should decide amongst themselves who should host the link collections, in order to prevent everybody hosting a different copy. If you would like to host a publically accessible link collection that you were in prior to the OTA, then you must do the following.
In the dojo, run
:graph-store +dbug [%state '~(key by archive)']
> {[entity=~nus name=%posts-853] [entity=~nus name=%music-384]}