Version 0.1.7 - Windows/Steam
Two enemies on the Realm Map were positioned near me so that taking one step would cause both enemies to reach me.
I took a step and this started a battle against one of the two enemies.
After the battle, the second enemy was gone. (It appears that it stepped on top of me and disappeared without me getting a chance to fight it)
I had the Realm Quest “Natural Born Killer”. This made it impossible to complete the Realm Quest. (After this enemy disappeared, I explored the Realm thoroughly and there were not enough enemies present to complete the quest)