Did Chromium 112 change how WindowClients are set/not set?

[guest271314]

On Chromium 112 when I append an iframe to a document with src set to a chrome-extension: URL the document is no longer registered as a WindowClient in the ServiceWorker and navigator.serviceWorker.getRegistrations() also returns an empty array.

Is this working as intended? When, where, and why was the behaviour changed?

[guest271314]

The cause of this on Chromium 112 is evidently rooted in at chrome://flags

Experimental third-party storage partitioning.
Enables partitioning of third-party storage by top-level site. Note: this is under active development and may result in unexpected behavior. Please file bugs at https://bugs.chromium.org/p/chromium/issues/entry?labels=StoragePartitioning-trial-bugs&components=Blink%3EStorage. – Mac, Windows, Linux, ChromeOS, Android, Fuchsia, Lacros

#third-party-storage-partitioning

See privacycg/storage-partitioning#25 https://groups.google.com/a/chromium.org/g/net-reviews/c/itOHk-vM8r8.

Either disable at chrome://flags or launch with --disable-features=ThirdPartyStoragePartitioning flag for a chrome-extension: protocol iframe appended to a document on the Web to be set as WindowClient and ability to get the active MV3 extension ServiceWorker with navigator.serviceWorker.getRegistrations().

[Olamide bobby]

It is working perfectly as of recent research and report. 

[guest271314]

> It is working perfectly as of recent research and report. 

I don't think so. 

[Mike Taylor]

Do you have chrome://flags/#enable-experimental-web-platform-features enabled? That would enable third-party storage partitioning (unless you did turn on #third-party-storage-partitioning
at some pint) but otherwise this should be considered a bug.

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[guest271314]

> Do you have chrome://flags/#enable-experimental-web-platform-features enabled? 

Yes.

I did not enable Experimental third-party storage partitioning. This breaks  ServiceWorker/WindowClient. I havn't tested localhost embedded in an iframe cross-origin, with appropriate headers served.

Is the expected result to for the iframe to not be a WindowClient of ServiceWorker?