Thanks for the response man. I removed my generator like you asked and it does seem like that is the cause to part of the issue as I too was unable to replicate it by just placing my room BPs or using a (much simplified) version of my generator to mimic the adding of the rooms at runtime. However, part of the issue I was able to replicate, but I’m not sure if there’s really anything that can be done as I believe its just part of the way the toolkit is engineered because of the tile indexing. If a BP is placed so part/all of the child subgrid goes beyond the 0xy of the main grid, it ceases to become functional. I noticed that if you place a subgrid in the scene, it wont even let you move the thing beyond these limits due to the aforementioned theoretical limitations.
I honestly believe I just need to reimplement the toolkit and my dungeon generator a bit differently, as the current way the indexing works for the grid/subgrid is going to make using the subgrids within a BP placed at random locations this way impossible. No worries though, I’ve already got a more semi-random placement method in my head, just need to map it out (no pun intended).
https://i.imgur.com/TlmqwWC.jpg