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@BrickMan
^^ Tapers look a bit mashed up, been on the wrong BB taper / over torqued perhaps? Some cranks are very sensitive to it, and being records they'll likely be fairly specific on the required torque value.
Also that break looks like it has a newer and an older part to it. Upper part of the sheer is darker/tarnished vs. the lower parts more shiny appearance, would suggest its been propagating for a while?
I had a set of middleburn RS7's that I cracked the left hand from edge of taper to edge, rode home, didn't get worse but could feel it flexing out, they replaced it, then a few years later it happened again pretty sure crank had never been off in that time either. They won't replace this time as they are a new company so older products warranty is now VOID AFAIK.