Preflight Checklist

• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Potentially related issue, but the guidance in here did not solve it: #5496

Describe the bug
The app.diagrams. page keeps telling me to install the plugin (even though I already installed it). (see screenshot with devtools open)

I have already installed the plugin and accepted its permission request. (See screenshot)

I also made sure that Third-Party Cookies are enabled and even explicitly added the domains that the extension needs.

I am successfully logged into Lucidcharts in the same browser in a different tab.

Chrome Version: 145.0.7632.117 (Official Build) (arm64)

Console Errors:

import.html:30 Refused to apply style from 'https://app.diagrams.net/tools/lucid/mxgraph/css/common.css' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.Understand this error import.html:1 Unchecked runtime.lastError: The message port closed before a response was received. 

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
I expect it to not prompt me to install the plugin and find the Lucidchart diagrams to export/import.

Screenshots
See above

draw.io version (In the Help->About menu of the draw.io editor):
Not sure.

• draw.io version x.y.z

Desktop (please complete the following information):

• OS: Max OS (Arm)
• Browser: Chrome
• Browser Version: 145.0.7632.117 (Official Build) (arm64)

I tested the problem in incognito/private mode with all browser extensions switched off, write "yes" below:

• No. That wouldn't work.