could you pls provide us any sample test file/URL,screenshot of the issue along with chrome version and OS details to triage further.
ccing the dev as per comment#1 to get inputs

Thanks,

I'm using Chromium through WebView2 and Electron. I mentioned that version above. Started happening in 133.0.6920.0, continues in 134. I'm on Windows 11. I will link to some minimal example later when I get a chance.

easiest way, on my end at least, to repro this is to follow the repro steps listed here:
https://github.com/MicrosoftEdge/WebView2Feedback/issues/5185
or
https://github.com/electron/electron/issues/46428
(here, you'll want to download Electron Fiddle and load the gist link in that's listed in the issue report)

Tested the issue on Linux debain using chrome version 135.0.7049.52 with the below steps

1. Open example.com
2. execute this code code to add a normal and a partioned cookie to the example.com frame: cookieStore.set({ name: "Normal-Cookie", value: "normal-value", secure: true, path: "/", sameSite: "none" });cookieStore.set({ name: "Partitioned-Cookie", value: "partitioned-value", secure: true, path: "/", sameSite: "none", partitioned: true })
3.Check the cookies in application tab
4. go back to previous page or refresh
5.observed that the cookies are cleared withou any issues

please find the attached screencast and confirm if anything missed here.
Request you once try the issue by upgrading chrome to latest stable and update the thread if the issue still persists.

Thanks,

My issue is not with going back to another page, it's specifically with using the Storage.clearDataForOrigin CDP function to clear the cookies in example.com. Can you try using that API?

Seems the issue requires to test with API which is out of TE scope hence adding TE-NeedsTriageHelp

Requesting dev team please look into this issue.

Thanks,