Upon depowering any redstone torch attached to the side of any valid block (solid, opaque and full size) the redstone torch will break as if the block attached to the redstone torch is not a valid block (nonsolid, translucent or partial size). The cause may possibly be because of bugged code in the off-state redstone torch class file.
Linked issues
Comments 3
I made my own issue for this and I thought that it was only when there was a block update detector, but this seems more probable. Thanks for putting this there.
Duplicate of MC-58920
Confirmed. I had to downgrade back to 14w25b to use my map.