Tom Sheehan notes notorious sloppiness, from GA 12's Aus einem Gesprach von der Sprache. Zwischen einem Japaner und einem Fragenden
Tezuka: [The problem is due] mainly to the confusion created by
your ambiguous use of the word Sein.
Heidegger: My own thinking has a clear sense of the distinction between Sein
as the Sein des Seienden [in metaphysics] and Sein as Sein with regard to its
own proper sense, which is openness (the clearing).
Tezuka: Then why didn’t you immediately and decisively hand back the
word “Sein” exclusively to the language of metaphysics? Why didn’t you
immediately give your own name to what you were seeking as the “meaning
of Sein” on your path through the essence of time?
Heidegger: How can I give a name to what I’m still searching for? Finding
that would depend on assigning to it the word that would name it.
Tezuka: Then we have to endure the confusion that has arisen.