December 23, 201411 yr In this video, a Stone Beetle is Engaging my Wizard. When the Stone Beetle burrows, the engagement arrow persists through the burrow. Also when I pause, one of the Stone Beetles teleports to my Wizard. It did not burrow either.
December 27, 201411 yr I have also seen this several times with creatures that do not bury, but simply just walked past my frontline. So while it perhaps always happens when beetles bury, there seem to be underlying problems in how engagement is handled.