UI breaks when selecting "Update diagram from clipboard" dialog becomes unresponsive and turns white

When selecting the "Update diagram from clipboard" option in draw.io (GitHub integration), the interface enters a broken state. The dialog becomes partially or completely white, and interactive elements such as buttons (e.g., Create/Submit/Save) stop responding. This prevents completing the intended action and disrupts the workflow.

To Reproduce

• Steps to reproduce the behaviour:

1. Go to a GitHub repository using draw.io integration
2. Open or create a diagram
3. Click on "Update diagram from clipboard"
4. Observe the UI turning white and becoming unresponsive
5. Expected behaviour

The clipboard content should be processed correctly, the dialogue should remain stable and interactive, and all buttons (Create/Submit/Save) should function normally.

Actual behavior

The UI turns partially or fully white, buttons become unclickable or unresponsive, and the dialogue appears frozen. The user cannot proceed further unless the page is refreshed.

OS: Windows 10/11
Browser: Chrome
Browser Version: 146.0.0.0
Smartphone (please complete the following information):N/A
Device: N/A
OS: N/A
Browser: N/A
Version: N/A
I tested the problem in incognito/private mode with all browser extensions switched off: YES

Start by reproducing the GitHub integration flow in Chrome: open a diagram and select “Update diagram from clipboard.” Trace that entry point to identify why the dialog turns white and stops accepting Create, Submit, or Save; done means clipboard updates leave the dialog stable and all listed buttons interactive.