I'm not 100% sure this is a bug, but I came across this scenario room earlier in a graveyard
http://cloud.steampowered.com/ugc/487750082595634630/18E902C24434071E75B...
It had an interactive shine in the middle which dropped a token. However there were invisible poison brambles in the area.
they aren't poison brambles, but there should be a poison haze to the area. It automatically poisons you when you walk into it.