Alright i'll try that ina bit. ThanksWell, if the torches and items are inside when you're trying to form it, I don't think it would allow that for one..
Another possibility that got one of the guys on a server I play hung up is the entire cube shape material is counted, not just the faces visible from the inside.
So they had dirt occasionally along the edge blocks of the tank and then it didn't allow it to form.
Those are what I can suggest from your screenshots
For some reason the tank isn't forming.
yes, but the inner volume of 11x10x6 makes an outer volume of 13x12x8...
As a note, it also does not like ice blocks for some absurd reason, in case anyone ever runs into this.
Because they melt (?)
k.try replacing all the walls and corners with cobble, see if it works.