Entity "name" and "CustomName" selector arguments not working.

What I thought would happen:

Using

or would result in finding any entities with name TEST.

What actually happened:

Block outputs "UUID is in the wrong format (etc.)" for "name" and "Found @" for "CustomName." After replacing the block from CustomName to name the command block is still outputting "Found @" but doesn't seem to be functioning beyond that. I.E. there's no redstone output.