pylint #36586 Incorrect errors and warnings produced when using multiple inheritance [open]

If a class uses multiple inheritance, pylint 0.21 does not pick up any but the first base class, if the bases classes are in a different module. 
For example:

## test.py
import testmodule

class C(testmodule.A, testmodule.B):
    def __init__(self):
        testmodule.A.__init__(self)
        testmodule.B.__init__(self)
        self.cvar = "C"

if __name__ == "__main__":
    c = C()
    print c.avar, c.bvar, c.cvar

## testmodule.py
class A:
    def __init__(self):
        self.avar = "A"

class B:
    def __init__(self):
        self.bvar = "B"


gewoia : pylint test.py
************* Module test
W0233:  7:C.__init__: __init__ method from a non direct base class 'B' is called
E1101: 12: Instance of 'C' has no 'bvar' member

I have various other errors and warnings as a result of this situation also.

The problem disappears if you move classes "A" and "B" into the same file. It is not present in version 0.19, don't know about 0.20.