Comment (by Roland Haas):

yup. Might even be that one should change SphericalSurface_Setupto SphericalSurface_Set in case SphericalSurface_Setup does not actually initialize sf_info (and thus scheduling relative it it is pointless). That would be future enhancement though (and needs some more checking for possible unanticipated side effects first).

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2625/carpetmask-should-not-be-scheduled-before