When items are being carried along a belt (not stopped) and a burner inserter tries to grab from a corner, it is too slow and refuses to grab anything (from either side of the belt).
same thing will usually happen with regular inserters as well, so not really a bug to me, but a handicap for using low-tech inserters.
Colonel Failure wrote:You can lose your Ecologist Badge quite quickly once you get to the point of just being able to murder them willy-nilly without a second care in the world.