CAutoComplete reference counting seems broken

During CAutoComplete::OnNCDestroy, the reference count is decreased Release().
If this is the last reference, this deletes the object, which means any further code accessing this or pThis further along in ATL cleanup code is accessing free'd memory.

This can be observed by running the Notepad++ 6.9 setup from rapps with DPH enabled,
or just opening an explorer window with DPH enabled, and closing it again.