Modpack version
0.4.3
Describe the bug
Using the building gadget (Building Gadgets) to place edge aligned glass (Pane In The Glass) will, instead, fill the block space with a noninteractive space that you cannot place other blocks in.

Yikes! Thanks for the report :D
Edit: Do you happen to have a screenshot of it?

I can confirm having this happen back in v0.3.13. It places in "invisible" blocks. TOP reports it as a PITG pane, but there's nothing rendered, you can walk through it (no collision box), but you can't break it (no hitbox). Fortunately I noticed what happened and managed to use the undo feature of the gadget to remove them and went back to placing them manually. This was in survival. It's been some time but I think I was using either the exchanging or building gadget itself.

In retrospect I should have not just chalked it up to another inter-mod incompatibility and reported it. (Old-school modded mindset of, "welp, don't do that again!" 🙃)

Also did it happen in survival or only creative? (The mod is a lot more permissive about attempting to do broken things in creative.)

Relayed the issue here:
MongoTheElder/PITG#19
Direwolf20-MC/BuildingGadgets#622