Comment (by Roland Haas):

In the ET call from 2021-08-05 Peter reported on having looked further into this and it seems that the issue was eventually tracked down to missing dissipation setting in the parameter file.

Unless objected I will close this ticket as “resolved” after 2021-08-13.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2540/unexpected-hamiltonian-violation-from