During the portion of the Quest "Investigate the beach" when you find Mirkon in the hideout after rescuing him, any time a summoned animal companion gets within a certain range of him or Mol they start spamming their dialogue and are unable to be interacted with until the companion is far enough away.

This was happening on PC/Steam, DX11 on at the time

I had almost the same problem. Only Mirkon appeared to be spamming the written dialog. I could right-click on him and select talk, but it wouldn't do anything. I could not selected talk for Mol. If I made the companion move away, the spamming stopped, but as soon as I clicked on my main, it came flying right back.