PQ Online cache/visual bug? Perpetual loading screen (Datamarts and Dataflow)

[myon]

Update 2023-05-10, can't author new Flows or Marts anymore:
Tried the browser debugger. It complains about

• 404: An iframe has both allow-scripts and allow-same-origin for its sandbox.
• 403 on /metadata/artifacts/definitions:1
• ERR_HTTP2_PROTOCOL_ERROR on europe.prod.powerquery.microsoft.com/api/trace/message

  Debugger message:

wabi-north-europe-e-primary-redirect.analysis.windows.net/powerbi/metadata/app?preferReadOnlySession=true:1 Failed to load resource: the server responded with a status of 403 () wabi-north-europe-e-primary-redirect.analysis.windows.net/metadata/artifacts/definitions:1 Failed to load resource: the server responded with a status of 404 () web.vendors.min.XXXXXXXXXXXXXXXXXXX.js:1 An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing. K.insertBefore @ web.vendors.min.XXXXXXXXXXXXXXXXXXX.js:1 /cdsaauthoring:1 An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing. ApiRequest.ts:179 POST https://europe.prod.powerquery.microsoft.com/api/trace/message net::ERR_HTTP2_PROTOCOL_ERROR

I have also tried these things

1. Check your permissions: Ensure that you have the correct permissions to access Power Query Online and the resources you are trying to access. You may need to contact your administrator to verify your permissions.

2. Clear browser cache: Clearing your browser's cache can help resolve issues that might be caused by cached data. To do this in Microsoft Edge, press Ctrl + Shift + Del, and then select 'Cached images and files' and click 'Clear now.'

3. Disable browser extensions: Some browser extensions can interfere with web applications. Try disabling any extensions you have installed and see if the issue persists.

Original message:

Upon editing a dataflow from this screen

I get stuck in a perpetual loading screen

Trying to navigate away from this screen in the UI gives me this error

Refreshing the web page through F5 or shift+F5 just brings me back to the first image.

How can I solve this?

Edit: Additional info
Using Edge Version 112.0.1722.68 (Official build) (64-bit)
Same issue in Chrome Version 112.0.5615.138 (Official Build) (64-bit)
Tried to edit another dataflow I authored 3 months ago, same issue

Edit2: I asked our PBI tenant admin two days ago to move our workspace to a capacity that we knew had less load since I thought this was the problem at first. Now, I should double check that this capacity does not have high load as well...but just wanted to say this while I check.

Edit 3: Capacity is not overloaded.

Edit 4: Firefox could not load either, same behaviour. Collegue could open it on his computer after ownership was transferred.

Edit 5: Same issue in Datamarts in the Get Data window

[myon]

Updated with more info.

[myon]

The issue persists to this day.

[myon]

This seems to be the same case. Going to check if I can get Firefox installed on my work computer.
Solved: Dataflow page not loading - Microsoft Power BI Community

Edit: Did not work.