Page contains an arena.im embed which is lost in IV.

This is a very recent article, and this embed is used often on this site, for example :
https://www.lejdc.fr/nevers-58000/sports/rencontre-au-sommet-entre-l-uson-nevers-et-le-ca-brive-suivez-le-match-en-direct_13522945/
https://www.lejdc.fr/nevers-58000/uson/l-uson-nevers-finit-l-annee-avec-une-victoire-bonifiee-face-a-vannes-et-en-leader-du-championnat-revivez-le-match_13089980/

See the recent string of similar "lost embed" issues accepted on this domain, e.g. https://instantview.telegram.org/contest/lejdc.fr/template14/issue3/ https://instantview.telegram.org/contest/lejdc.fr/template15/issue6/ etc, decision reads :
"Pages that display unsupported content [...] must not generate IVs."