api.Window.sessionStorage - Safari does not support duplicate tab

What type of issue is this?

Safari browser doesn't fully support the sessionStorage Specification

What information was incorrect, unhelpful, or incomplete?

It says that Safari supports sessionStorage. It does but not fully since when a user duplicates a Tab the sessionStorage is not being passed to the duplicated Tab. It is part of the requirements ;"Duplicating a tab copies the tab's sessionStorage into the new tab.
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What browsers does this problem apply to, if applicable?

Safari

What did you expect to see?

When duplicating a Tab, the sessionStorage should be copied to the new tab

Did you test this? If so, how?

Yes, I had a tab with sessionStorage in my laptop in Safari. I duplicated the tab and the sessionStorage is not passed.

Can you link to any release notes, bugs, pull requests, or MDN pages related to this?

No response

Do you have anything more you want to share?

No response

MDN URL

https://developer.mozilla.org/en-US/docs/Web/API/Window/sessionStorage

MDN metadata

Start with the MDN sessionStorage page and the api.Window.sessionStorage compatibility entry, then verify the reported Safari duplicate-tab behavior against the relevant specification. Update the compatibility data so Safari’s support level reflects the observed behavior, and confirm the resulting entry is accurate.