Hey Gavalakis, as a follow-up: I resetted my project according to my Github repo, and everything got back to normal. Then, I updated the NodeCanvas (deleting the older version first), played a few minutes with the scene and the corrupted node appeared again (I believe the repository’s NodeCanvas version is 1.5.8).
I’ll reset the project again and see if I can track down exactly when the behavior tree messes up.