Drawing rendered in Confluence but is blank in draw.io and cannot be resotred from history

[skritek]

Describe the bug
When using the Confluence draw IO plug in one of my embedded drawings, while rendered in the document fine is blank when opening in Draw.io Looking in the document history the page is there and it renders in the preview view but when trying to open it or restore from a previous document the page is blank and there is no XML

To Reproduce
Unfortunately you will not be able to see the Confluence behavior unless we have an online session

Steps to reproduce the behavior:

Scenario 1

1. Open the Confluence page where the document is embedded
2. Click on edit icon
3. Draw.io opens to blank page

Scenario 2

1. Open Draw.io
2. Navigate to the page
3. Page is blank
4. Check document history
5. Diagram is available in the preview
6. Click open or restore (doesn't matter)
7. No document

Expected behavior
The page in my draw.io document is rendered correctly or could be restored from history

Screenshots
Document in Confluence

Document after opening in Draw.io

draw.io version (In the Help->About menu of the draw.io editor):

• draw.io version v26.0.6

Desktop (please complete the following information):

• OS: Linux Ubuntu 24.04.1 LTS
• Browser Vivaldi (chrome. Doesn't work in FF either)
• Browser Version 7.0.3495.29 (Stable channel) (64-bit)

I tested the problem in incognito/private mode with all browser extensions switched off, write "yes" below:
yes. and I was not able to authorize draw to access my google account in incognito. Works fine normally

Additional context

[davidjgraph]

I would suggest to file a support ticket in the normal way, https://marketplace.atlassian.com/apps/1210933/draw-io-diagrams-uml-bpmn-aws-erd-flowcharts?hosting=cloud&tab=support