autocomplete from wrong type.

[kaddkaka]

class A:
    pass


class HasAnA:
    def __init__(self, a):
        self._a = a

    def get_a(self):
        return self._a


class Thing:
    def __init__(self, item: A | HasAnA):
        self._item: A
        if isinstance(item, A):
            self._item = item
        else:
            self._item = item.get_a()
        assert isinstance(item, HasAnA)

    def method(self):
        # self._item.  --> tab completes into:
        self._item.get_a()

When the member self._item is declared and assigned as above, pylsp seems to be confused about the type (Can I verify this somehow?)

When I try to tab complete after self._item. (see above) pylsp suggests the method get_a, which is not available on an instance of A.

I tried to clarify and change some types in the example, but the behavior stayed. Is there some other way to rewrite the inside of class Thing so that pylsp unserstands the type correctly?