Check for block in 6x6x6 procedure template bug.

Hi, I've been messing quite a lot with the "find block" procedure template, and I've noticed that the blocks it checks are sometimes incorrect in some axis.

I'm going to attach a image of what I mean:

In the image the block is using a unmodified template, and is set to locate the white block.

I have marked the places in which the "detector" detects the white block.

As you can see, in the axis -Z -X, the detector zone is larger.

Is this intencional or is this a bug?