Carousel photo items fill the private-chat log with yt-dlp error paragraphs

[miridius]

Private chats stream one yt-dlp ERROR paragraph per photo item of a carousel, including for posts the bot delivers successfully.

Repro 1: a post whose items are all photos

Send https://www.instagram.com/p/Dbk1RNUiXvi/ to the bot in a private chat. The log reads:

🧐 Scraping https://www.instagram.com/p/Dbk1RNUiXvi/...

ERROR: [Instagram] Dbi3QbCCZYU: No video formats found!; please report this issue on  https://github.com/yt-dlp/yt-dlp/issues?q= , filling out the appropriate issue template. Confirm you are on the latest version using  yt-dlp -U
ERROR: [Instagram] Dbi3Qa4Cdzq: No video formats found!; please report this issue on  https://github.com/yt-dlp/yt-dlp/issues?q= , filling out the appropriate issue template. Confirm you are on the latest version using  yt-dlp -U
ERROR: [Instagram] Dbi3QbDCT1Q: No video formats found!; please report this issue on  https://github.com/yt-dlp/yt-dlp/issues?q= , filling out the appropriate issue template. Confirm you are on the latest version using  yt-dlp -U
ERROR: [Instagram] Dbi3QbFib96: No video formats found!; please report this issue on  https://github.com/yt-dlp/yt-dlp/issues?q= , filling out the appropriate issue template. Confirm you are on the latest version using  yt-dlp -U
ERROR: [Instagram] Dbi3QbCCcTd: No video formats found!; please report this issue on  https://github.com/yt-dlp/yt-dlp/issues?q= , filling out the appropriate issue template. Confirm you are on the latest version using  yt-dlp -U

💥 Download failed: Dbi3QbCCcTd: No video formats found!

One paragraph per photo, each carrying yt-dlp's issue-tracker text.

Repro 2: a post that mixes photos and videos, delivered successfully

Send https://www.instagram.com/p/DIqghhpok2K/ (three videos and one photo) in a private chat. All three videos arrive, and the log still opens with an error:

🧐 Scraping https://www.instagram.com/p/DIqghhpok2K/...

ERROR: [Instagram] DIqghVaoyOR: No video formats found!; please report this issue on  https://github.com/yt-dlp/yt-dlp/issues?q= , filling out the appropriate issue template. Confirm you are on the latest version using  yt-dlp -U

🎬 Video info:
...
🚀 Uploading (3.63 MB)...

Scope

The stderr streaming this comes from predates #28: that PR left the streaming loop untouched and changed only the final verdict line (which no longer carries the issue-tracker text). Observed on ce698d7 against the live dev bot.