cookies not isolated?

[zesty]

Before submitting a bug report

• I updated to the latest version of Multi-Account Container and tested if I can reproduce the issue
• I searched for existing reports to see if it hasn't already been reported

Step to reproduce

related to closed issue #404 firefox: 131.0.3

3 tabs:
1 - container 1
2 - container 2
3 - no container

Load cnn.com in all 3 and open dev tools. Open storage -> cookies -> cnn.com
Update the value of the wbdFch cookie in one of the tabs (pick any cookie really, but some of them are updated dynamically and often).

Actual behavior

Other tabs' cookies are updated too.

Expected behavior

Other tabs' cookies not updated.

Additional informations

Am I not understanding something trivial about how this is supposed to work?

Seems it stopped working at one point, but could reproduce with a new set of tabs.

Also tested on tidal.com in a different firefox profile.

Provide a copy of Troubleshooting Information page (optional)

No response