I from the base cube, you select a face, take this face behind the opposite one, then come back 1 grid on the other side you'll end up with something like that
![20211003200436_1.jpg 20211003200436_1.jpg](https://forums.zaviinetstudios.com/data/attachments/0/53-ad55436c5b488479114b75f615549177.jpg)
It totally prevent any change you could do with it, even if you change to hard mode
Edit : occured in 0.14.48