I had to change Id64.isInvalid to !Id64.EntityReferences, because Id64.isInvalid sees "e0" as valid id.
The problem was, that IModelCloneContext was trying to find relationship's target or source element that does not exist in the target iModel. So when findTargetEntityId returns "e0" for element referenced by relationship it would pass if statement with Id64.isInvalid and transformer would crash because ECSqlStatement.bindId can't bind invalid64Id.
Now IModelCloneContext.findTargetEntityId will return invalid id for target iModel relationship.
I had to change
Id64.isInvalidto!Id64.EntityReferences, becauseId64.isInvalidsees "e0" as valid id.The problem was, that
IModelCloneContextwas trying to find relationship's target or source element that does not exist in the target iModel. So whenfindTargetEntityIdreturns "e0" for element referenced by relationship it would pass if statement withId64.isInvalidand transformer would crash becauseECSqlStatement.bindIdcan't bind invalid64Id.Now
IModelCloneContext.findTargetEntityIdwill return invalid id for target iModel relationship.