Department of Physics2024-11-0920230031-900710.1103/PhysRevLett.130.0214012-s2.0-85146310246http://dx.doi.org/10.1103/PhysRevLett.130.021401https://hdl.handle.net/20.500.14288/9504Self-interacting vectors are seeing a burst of interest where various groups demonstrated that the field evolution ends in finite time. Two nonequivalent criteria have been offered to identify this breakdown: (i) the vector constraint equation cannot be satisfied beyond a point where the breakdown occurs, (ii) the dynamics is governed by an effective metric that becomes singular at the breakdown. We show that (i) identifies a coordinate singularity, and can be removed by a change of coordinates. Hence, it does not signify a physical problem, and cannot determine the validity of a theory.Physics, multidisciplinaryJournal Article1079-7114919680000008Q111833