I have encountered this bug on both Galaxy J7 and iPad Air 2. It basically prevents the burn particles of the furnace to come from the relevant side. They always come from the same direction on the coordinate plane.
MCPE-14628
Weird Furnace Bug
Resolved
Duplicate
0
(Unassigned)
Unconfirmed
Phone - Android - Samsung Other (Specify in description)
Android 5.1
0.14.2, 0.14.3, 0.15.0 Beta build 1
Retrieved
Thank you for your report! This issue was, however, submitted at an earlier time as MCPE-10760. You may add any information you find relevant in the comment section there.