See the screenshots.
Steps to reproduce
Place a coloured banner against the side of a cactus
Cactus block and black banner drops
Linked issues
is duplicated by 1
Attachments
Comments 3
Confirmed for 1.8-pre1, not a dupe of MC-63010.
edit: This is probably most easily fixed by not allowing the placement of banners (and maybe signs as well) against cacti.
No description of what happening?