hey, @tibo7848! can you please specify the issue you're having so we can have a look at it? what does the hint tell you to do? and what message do you get when trying to leave the forest glade?
you're right — having both "no true scotswoman" and "buried truths" active at the same time makes the game think isabelle is at the forest glade with you, but she's actually locked in the homeroom. OP joined our server so we ended up chatting there, but this bug has been fixed! please download the newly released v.1.9.1