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5d9546f9 introduced a change to synapse behaviour, in that failures in the interactive-auth process would return the flows and params data as well as an error code (as specced in https://github.com/matrix-org/matrix-doc/pull/397). That change exposed a bug in Riot which would make it request a new validation token (and send a new email) each time it got a 401 with a `flows` parameter (see https://github.com/vector-im/vector-web/issues/2447 and the fix at https://github.com/matrix-org/matrix-react-sdk/pull/510). To preserve compatibility with broken versions of Riot, grandfather in the old behaviour for the email validation stage.