Comment (by Miren Radia):

I tried again with the main branches of CarpetX/SpacetimeX rather than Liwei’s development ones (i.e. without subcycling) and ran into a different problem related to the PunctureTracker thorn. I’ll open a new ticket since I think it’s a separate issue.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2890/carpetx-crash-failed-assertion-in-z4c_rhs