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Cameo 2026x SysMLv2 does not seem to support empty entry notation yet and also interprets a then from an entry as a Succession not Transition.
However, tt may be that the form shown in the SysMLv2.0 spec p.115 and p118 is itself incorrect as that form is not used in the OMG SysMLv2 sample ptc-25-04-31.sysml.