It appears that the Dynare manual entry regarding the estimation option selected_variables_only:
selected_variables_only
Only run the smoother on the variables listed just after the estimation command. Default: run the smoother on all the declared endogenous variables.
is not valid with respect to the default - as it appears to me that this option is in effect even without explicitly declaring it (in which case options_.selected_variables_only=0), i.e., the oo_.SmoothedVariables structure contains only those variables listed below the estimation command even without that option having been activated.
So, maybe the particular manual entry should be altered.
gin