ToME: the Tales of Maj'Eyal

I switched places with a mucus ooze, and this caused the mucus ooze to turn into a copy of myself. I can not switch places with it, so it's kinda blocking my path.
When I linked it in chat, I got the achievement for linking myself in chat, and the chat client immediatly lost connection, and re-established it. Second time, I could link my char without chat client disconnecting.

Just did the same thing with a summoner and a summoned hydra.

I saved and exited once to be sure it was a persistent bug. I'm pretty sure it was before I picked up and artifact called gloomstone, and it was definitely before I linked myself in chat.

Here's logs and a screenshot.