Nothing happens when I change presets

Made with iPlug2
1

Hey, everything works well on the vst2 version. But on the vst3 version, when I select a preset, flstudio notices the preset change and even states the name of the preset like:
Beach Drums (Internal) 2/6
But nothing happens, knobs don’t move and the plugin’s effect doesn’t change. I added the following lines (in -win.props) to enable VST3 presets:

</BuildMacro>
<BuildMacro Include="VST3_PRESET_LIST">
  <Value>$(VST3_PRESET_LIST)</Value>
</BuildMacro>

Did I do it wrong?
Am I forgetting something?