As you can check, <div> with selected text has special @class="itemIntroText" and on every page of bykvu.com lead highlighted by dividing lines, and has a different look from article text
But, as you can see, description for that page has text "Ролик..." which is contained NOT IN LEAD SECTION
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https://instantview.telegram.org/checklist#3-2-link-preview
This page have lead section (https://instantview.telegram.org/contest/bykvu.com/template2/issue4/), but it is not used as a description. Instead of it it uses all text (untill Telegam cut it)
As you can check, <div> with selected text has special @class="itemIntroText" and on every page of bykvu.com lead highlighted by dividing lines, and has a different look from article text
But, as you can see, description for that page has text "Ролик..." which is contained NOT IN LEAD SECTION