The glitches are different for both blocks;
Torches- Will have a black spot on the side of the torch in which it is placed.
Sugarcane-Will have a black spot, on sides that block are directly adjacent to it.
Environment
Windows 7; Java 7, Update 60
MC-56381
Lighting Glitch on Sugarcane and Torches
Resolved
Duplicate
0
Lighting glitch with sugar cane is a duplicate of MC-54039
Lighting glitch with torches is a duplicate of MC-50263