Tuning Value don't work with set controls wait

Hi,
I following this How spice directive to add user defined signals - #8 by holger
to plotting a strange gain function of too nodes V(a)/V(b) and work very well. But I realize, the tune value re-run simulation seem to not re-execute the .conctrol block - so I do not have a update plot until I manuall change value and re-run the simulation.
Any though?

This is a ngspice issue. I have to figure out what is going on.

There seems to be no immediate, simple solution.

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