url panlet doesn't display dashboard from external thruk site

[jframeau]

Describe the bug
A weird behaviour with panorama's url panlet widget.

Let says we have 2 sites, x and y and I want to display on x a dashboard designed on y, using url panlet so. The panlet shows up the dashboard when you unlock it but at the first refresh, no more dashboard, the panlet is empty.

But using url panlet on any web site is ok.

Thruk Version
OMD 5.20

Desktop (please complete the following information):

• Browser: Firefox, Chrome, Edge in their last version