The session storage added in iframes are not maintained which going to it directly in same tab. This happens only in Safari latest version 16.1 and Business impact is happening Steps to replicate it Note: Pls add w w w. in front for URLs  Go to premierinn.com/ and in session storage you can see secure2.premierinn.com (which is an iframe in this page) as shown in Premierinn_home.png attached image.  Add new test key/value to secure2.premierinn.com session storage as shown in Premierinn_addSession.png attached image.  Go to this URL premierinn.com/gb/en/hotels/england/greater-london/london/london-barking.html?ARRdd=05&ARRmm=04&ARRyyyy=2023&NIGHTS=1&ROOMS=1&ADULT1=1&CHILD1=0&COT1=0&INTTYP1=DB&BRAND=PI and you can see the session storage in secure2.premierinn.com still have testkey we added in previous step as in Premierinn_HDP.png attached image  Click Book now and this will redirect to secure2.premierinn.com/gb/en/booking-a1/extras.html in which the new key we added last steps is not visible in safari 16.1 as in Premierinn_session_cleared.png attached image  But the same is retained in safari lower versions like 15.3 Premierinn_session_maintained_15.3.png attached image.. Also working in all latest versions of Chrome, Firefox.