When you place torch on top of tall grass, you get very quick box that has pink and black on it.
Environment
64Bit, Most recent Java.
MC-47786
Tall grass + Torch = Pink Black Block
Resolved
Duplicate
0
You clearly have pictures of this, but I myself can't reproduce it. It might only be happening on some computers.
The developers might benefit from attaching a crash report (Hold F3+C for 10 seconds, then release) to this ticket, in a case like this.