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Note that the SysML2.0 spec has examples of expose with ::** BUT combined with filters. Example from p.152:
view 'vehicle parts view' : 'Part Structure View' {
// Recursive import is useful for exposing elements
// from hierarchical models.
expose VehicleDesignModel::**;
// This is an additional filter condition.
filter not @SysML::ConnectionUsage;
...However, including such filters does not completely protect against the issue, Cameo seems to trace recursively through large portions of the metamodel (some elements of which might pass the filter anyway).