The WaveMoL example in CactusExamples computes the wave energy as E = phi_t**2 + phi_i*phi_i over the whole grid. However it does so on MoL_PostStep and ends up doing so before it applies boundary conditions and SYNC to the evolved variables (phi, phi_t and phi_i).

Pull request https://bitbucket.org/cactuscode/cactusexamples/pull-requests/3/wavemol-compute-energy-only-after-field-is addresses this.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2630/wavemol-example-computes-energy-from