libFieldFunctionObjects writeInterval

In the v1712 release the following libFieldFunctionObjects

dummy
{
    type    wallShearStress;

    libs ("libfieldFunctionObjects.so")

    writeControl    timeStep;
    writeInterval   1e+06;
    writeFields no;

    patches ("board.*");
    log     no;
}

writes the wallShearStress field in the case directory every time step. The same controlDict sintax worked fine for the same case with the 2.4.0 version, with the field object written every specified write interval (using outputInterval in the old version).