It took quite a bit to narrow down why it seemed to work fine for me when I first started screwing around with this new tool, but eventually I discovered that if the selection that you are trying to construct is wider than 4 blocks, then any torches that point out towards the left, do not get placed at all. However if it is 4 blocks or less wide, regardless of how tall it is, the left facing torches place just fine.

I had some other problems with things not placing but haven't found a pattern yet. Sometimes it was platforms not placing, sometimes mine track had a big gap in it.

This tool is absolutely AMAZING, and I love it so much. It really is amazing for my playstyle. I will keep trying to narrow down the circumstances to reproduce other bugs where items don't get placed and report them in discussions here on steam as well.

Thanks so much to the creators of this fantastic mod. Magic Storage may still have you beat in that department but everything else is truly phenomenal. You should be very proud :)