Which navies explored automatic cruiser guns after 1945

Were navies other than Britain and the United States considering automatic cruiser main guns after the Second World War?

Yes. France was, and Soviet designers were probably investigating comparable ideas as well.

France is identified as another navy examining automatic main guns for cruisers after the Second World War. Soviet or Russian designers probably investigated comparable ideas and regularly explored new gun concepts. No particular weapon is named in this brief answer, so the useful point is the international breadth of the research rather than a specific system history.