self.my_attr.my_method(self.f<tab>

Becomes:

self.my_attr.my_method(self.my_attr.my_method(self.foo

It looks like it would grab and prepend the front part of the line.

Workaround

Rolling back to 8.7.0 solves it.

Repro

Unfortunately, I failed to reproduce it with simple setup with a simple class and method and attribute.

But I easily reproduce this bug at my work projects (which are huge... and have so much complicated dependencies). I think this bug wouldn't manifest itself unless the code base is complicated enough.

I've confirmed 8.7.0 doesn't have this issue.