Comment (by Liwei Ji):

Hi Miren,
please ignore the puncturetracker branch and use development branch of my fork instead. Also, please keep CarpetX::poison_undefined_values=no` for now.
I can see why the fix in puncturetrackerisn’t appropriate -- thanks for pointing it out.

I apologize for all the inconvenience, and I’ll get them fixed soon.

By the way, here are some branch configurations that are working for me. I’ve been testing them quite frequently.
https://github.com/lwJi/Tutorial-Subcycling

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2892/spacetimex-gpu-error-in-puncturetracker