Recall of parameters broken

[magnetophon]

After an upgrade from faust 2.0.a51 to 2.1.0, some parameters of plugins did not recall properly in Ardour.

For example this parameter: https://github.com/magnetophon/shelfMultiBand/blob/master/shelfMultiBand.lib#L43

In ardour this somehow turns from

    <Controllable name="max release" id="21444" flags="" value="200.000000000000" parameter="9" symbol="max_release_9"/>

into

    <Controllable name="max release" id="142653" flags="" value="0" parameter="7" symbol="max_release_7"/>

Also IDK why the parameter number goes from 9 to 7.

This might be an issue with Ardour, and not with faust2lv2, but I don't know how to determine that. Any hints are appreciated.