Affects Version/s: Minecraft 16w05a
Fix Version/s: None
Environment:Windows 10 x64bit
Player using book to 'cast' click on a score command targeting themselves does not work on half slabs. More correctly updating score with book fails between elevation of y@.50-y@.56 (y@=full number in the y axis).
Have tested this bug as far back as the chain and repeat command blocks were added and always fails.
Below are commands to replicate:
Command Block chain on repeat: