Comment (by Roland Haas):

yup. I had not updated my own repo. Sorry about the confusion. particle_tracerET is actually a newly submitted module in the Schwarzschild release. Anyhow, assigned to @Zach Etienne .

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2741/some-thorns-seem-to-incorrectly-use