I have created multiple bee enclosures and randomly the bees escape to the exterior of the enclosure.  At first I thought it was because the bee nests/hives were adjacent to the walls so that the bees were occassionally glitching into the walls when leaving the nests/hives.  I then moved all the hives and nests at least one block from the enclosures walls.  The issue persists and has nothing to do with the bee tracking a player with flowers.  twice i returned to the enclosures to find bees outside. (I know they were my bees as i named them all).  It occurred numerous times with 3 seperate enclosures.