How to reload WidgetKit timeline from helper app?

I have a macOS app that contains an always running helper app, and a (new) WidgetKit extension.

It seems that the helper app cannot reload the extension using WidgetCenter, and asking for the current configurations (via getCurrentConfigurations) returns an empty array.

Is there a recommended way for this to work?
How to reload WidgetKit timeline from helper app?
 
 
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