Green shields spawning inside walls

[Mathero]

The green shield bugs appearing in the first two Ng+ spots can sometimes spawn inside walls, I've linked a screenshot of one of them. The other one was stuck under the house but still accessible enough to be killed so I didn't think much of it. The one shown in the screenshot though is inaccessible, checked around and it doesn't seem to have been reported. It's no big deal but still sucks having one less bug I can farm.