WebEngine and cache usage

[theunsheydenrych]

When using the URL "https://sandcastle.cesium.com/", you are presented with a webpage where you can zoom in on the earth, I can see that the cache is being populated (cache directory size is growing) and when unplugging the network I can browse to previous areas, and I can see that the WebEgine is using the cached data.

When using a URL "http://<ip>:8080/geoserver/wms" where I provide the data on the local network, the WebEgine cache the new data, I can see that the data is cached (cache directory size is growing), but when unplugging the network it does not use the cached data, like in the previous scenario.
I am using Qt6.2.0

It is the same code just with different URL's?
What could the problem be, any advise will be appreciated?

WebEngineView {
     id: webEngineView
     anchors.fill: parent
     clip: false
     profile: WebEngineProfile {
         storageName: "Profile4"
         offTheRecord: false
         httpCacheMaximumSize: 1073741824 // 1GB cache
     }
     url: "https://sandcastle.cesium.com/"
     //url: "http://<ip>:8080/geoserver/wms"
 }

Regards