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"it contains unsupported embed. I made a rule ?not_exist for this element"
- Andrey
When telegram add support for that embed your template will not generate pages with it.
Checklist says:
If the unsupported widget has an iFrame version, make it into an <iframe>.
https://instantview.telegram.org/checklist#6-4-2-video-audio-from-unsupported-players
There are not a single word about not generating pages with unsupported embeds at all by hardcoding with "?exists" rules.