XF 2.2 Safari 16.4.1 causing error 'page no longer available'

This is a member's only forum accessed using the RestAPI auth/login-token.
Until the recent Safari upgrade this has been working taking the user directly to the forum listing.
Now Safari users who have updated to 16.4.1 are getting the error 'This page is not longer available. Please go back and try again'.
Going back and trying again works but why does it not work first time following the upgrade?
The only clue I have is a possible connection with the api logon not recognising the destination page.
The need to access the forum twice is enough to discourage users so any suggestions as how to overcome the problem would be appreciated.

Nigel Nelson
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