Highchart Export Server stopped exporting public images

[jttim23]

Hi,
I've been using highchart export server in my application. Im having issues with exporting background images which are links to public source image. Now the image is not being exported with a chart.
What is interesting, this approach worked and it stopped recently (around February).

Additionally I tried using locally run export server which fixes the issue but it will be problematically to install it on prod environment thus trying to avoid this.

Expected behaviour
Image must be included inside exported chart
Actual behaviour
Chart is exported without background image
Live demo with steps to reproduce
DEMO
Product version
"highcharts": "^11.4.8",
"highcharts-react-official": "^3.2.1",