Shortcut external URL does't work

I have defined a Label Card with an “External URL” action. The URL launches an iOS shortcut (that opens another app). The URL is shortcuts://run-shortcut?name=name-of-the-shortcut
This works in Safari. If I click on the label it opens the app through Shortcuts.
But it doesn’t work in the iOS openHAB app. If I change the URL to it works.
Is it a bug?