Comment (by Gabriele Bozzola):

What I mean is that currently if you set evolution_method = LeanBSSNMoL you get the evolution of the metric, lapse, and shift. With the behavior I describe, one must set evolution_method = LeanBSSNMoL, shift_evolution_method = LeanBSSNMoL, lapse_evolution_method = LeanBSSNMoL to achieve the same evolution. If the other two are not explicitly set, their default value will be zero if I remember correctly. This is a breaking change because currently one doesn’t need to specify the other two evolution methods currently, so if one didn’t specify them, with the new version the evolution will be different.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2487/_evolution_method-leanbssnmol-in-lean-does