Xray

Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report ([minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]) to this ticket.

this bug i´m ocurred on my pc from 15w33 when i´m break a block this has break, but continue rendering the breaked block, but when a near chunk is updated or the lagged render updete is executed this render block bug was update and the render has normalized

NOTE:
this bug is from the optifine code implemented in 15w33

Ticket resolved as incomplete, because no answer in a reasonable amount of time (1+ year), if it still happens, please update the ticket.