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The change in f105fbe52b21da206bfbaedf0e92326667d7b2d4 made through=None m2m fields fail in cases where they worked before. It isn't possible to create such fields using public APIs. The fix is trivial, so it seems worth fixing this for custom m2m field users. This is not a backport from master. Master has gotten enough other changes to related fields internal API that this fix alone isn't enough to do any good.