code freezes on PC.correct_tree_tops()

[BC14w]

I get a fast turn around getting numbers of trees detected but this part of the code keeps loading forever. In task manager it shows nothing is loading. I've tried skipping this piece of code , but then the same happens on PC.screen_small_trees(hmin=3., loc='top').
I had no issues running it 2 weeks ago. but for some reason, now it freezes. Is there any known update in the necessary libraries that would need updating?