First of all thanks for this new B038 new rule, it's a great addition!

Using flake8-bugbear 24.1.15

The following code is flagged.

some_list = [1, 2, 3]
for elem in some_list:
    print(elem)
    if elem == 2:
        found_idx = some_list.index(elem)  # should not error
        break

Although a method of some_list is called I believe this doesn't have any effect on the mutable