In a stimulus, when simultaneous is nested in sequential, the datablocks are played sequentially instead of simultaneously

[bdieudonne]

For example, in the following stimulus, hoed and kous are played sequentially instead of simultaneously:

    <stimulus id="stimulus_hoedkous">
      <datablocks>
        <sequential>
          <datablock id="datablock_silence1000"/>
          <simultaneous>
            <datablock id="datablock_hoed"/>
            <datablock id="datablock_kous"/>
          </simultaneous>
          <datablock id="datablock_silence1000"/>
        </sequential>
      </datablocks>
      <variableParameters/>
      <fixedParameters/>
    </stimulus>

Minimal working example is attached:
bugreport_sequentialVSsimultaneous.zip