Prior to 16 February 2021 Only the First Web Story Was Credited with an Impression and Click in Search Console Performance Report
https://www.seroundtable.comGoogle has made a change to its performance report around reporting on your Web Stories. This change may lead to seeing more impressions and clicks from Google Discover to your web stories.
Till now only the first Web Story was credited with an impression and click. but starting on February 16, 2021 and onward, any additional Web Stories that were reached from the first Web Story in Discover will also be credited with an impression and click in the Performance report for Discover.