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I can reproduce the issue:
$ cat foo.py 
BB = 1
__all__ = ['BB']
$ python3 -c 'import foo; print(dir(foo)); from foo import *'
['BB', '__all__', '__builtins__', '__cached__', '__doc__', '__file__', '__loader__', '__name__', '__package__', '__spec__']
Traceback (most recent call last):
 File "<string>", line 1, in <module>
AttributeError: module 'foo' has no attribute 'BB
(Note the ascii 'BB' in the dir(foo))
There's also an easier way to reproduce it:
>>> BB= 3
>>> BB
3
>>> BB
3
>>> globals()['BB']
3
>>> globals()['BB']
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
KeyError: 'BB'
>>> globals()
{'__name__': '__main__', '__spec__': None, '__builtins__': <module 'builtins' (built-in)>, '__loader__': <class '_frozen_importlib.BuiltinImporter'>, '__doc__': None, 'BB': 3, '__package__': None}
>>> class Foo:
... B B= 3
... 
>>> Foo.BB
3
>>> Foo.BB
3
It seems the 'BB' gets normalized to 'BB' when it's an identifier, but not when it's a string. I'm not sure why this happens though.