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Got some information that this problem might be involved:
https://world.optimizely.com/documentation/Release-Notes/ReleaseNote/?releaseNoteId=CMS-24951
But after upgrading to latest packages (released August 22) we can still reproduce.
We see this issue in a DXP multisite setup from time to time, it's quite common after idling a bit and then switching site...
Edit Mode only has the navigation parts and the main area is empty.
Looking in network tab of browser dev tools we see 400 responses for various URLs under /shell/stores/ and /cms/stores/.
Here's a Application Insights KQL query you can run in Logs if you have it:
GET ProfileStore/Get [area/id/module]
GET ContentTypeStore/Get [area/id/module]
GET SiteStructureStore/Get [area/id/module]
GET VisitorGroupStore/Get [area/id/module]
GET ComponentStore/Get [area/id/module]
GET UIDescriptorStore/Get [area/id/module]
GET ContextStore/Get [area/id/module]
GET ContentStore/Get [area/id/module]
GET SearchProviderStore/Get [area/id/module]
Usually a Ctrl+F5 in the browser makes it load fully.
Have not been able to grab any underlying exceptions (yet).
On .NET 6.0 and these versions currently:
I guess it could be some cookie mixup etc since it seems hard to find any underlying information triggered by the request.
The domain name is the same for all DXP environments but with varying sub names.