The command block texture seems to be dislocated as one side is 2 pixels apart from the edge
and the other is 3 pixels apart and that applies to all sides of the command block. If you have the time and you bother paying attention to it, please fix it.
Environment
I've found a texture bug on Java Edition that includes command blocks
OS: Windows 10
Version: 1.9 - 19w06a
Duplicates MC-90580 (invalid).