Unavoidable inability to perform is different from a deliberate false promise. Some conflicts also raise questions about release, renegotiation, and urgent competing duties. The debate asks whether the wrong is explained by deception and disrespect, the damage to a shared practice, or the consequences for the people who relied on it.
Suppose you promise to attend a meeting and later encounter someone needing urgent assistance. The new conflict differs from making a promise with no intention of attending. Ask whether you should notify the other party, seek release, arrange a substitute, or repair the inconvenience. Keeping these possibilities visible avoids treating every unfulfilled promise as the same moral failure. A principle about truthful commitment also needs an account of changed circumstances and competing responsibilities.