Hey there
1. It is most likely due to 2 triggers being too close to each other, if you open one, then retreat a bit and return the second chest should be interactable, sorry for that ^^
2. If I understand correctly it happened with a lurker after a sex scene in that spot, he was moved to another spot in the next patch.
3. This one, I sadly do not understand :(
When it comes to more stages of development, they are coming. I develop the game in a modular way and add more modules to it, step per step. Also, if you want to talk more in-depth, I invite you to my Discord server ^^ do feel free to dm me and then we can work something out.