Presets Palette: presets gone after update Parameters

Hello forum,

my first post and apologise in advance if this scenario has already been covered elsewhere.

I am using the Presets palette (I think correctly). I have a container for which I created some custom parameters. I placed the Presets palette inside this container taking care that “Install Parameters In Parent” is checked.

The issue I encounter is when I add a new custom parameter to my container. A window pops up asking whether I want to update my presets. I say yes expecting that the already saved presets would persist but this time with a new parameter in it. It could be the default value for that parameter, doesn’t really mater.
Instead what I experience is that the presets are all gone.

What am I missing?

Thank you in advance.

Roberto