core: Feedreader integration generating wrong events with Home Assistant blog's rss feed

The problem

I added https://home-assistant.io/atom.xml in feedreader configuration, but every time I restart my server instance feedreader generate events with Home Assistant blog’s rss feed, even there is no new elements in rss feed. All other rss feeds works with feedreader correctly. home-assistant.log events.txt feedreader.pickle.txt

What is version of Home Assistant Core has the issue?

core-2021.8.8

What was the last working version of Home Assistant Core?

No response

What type of installation are you running?

Home Assistant Supervised

Integration causing the issue

feedreader

Link to integration documentation on our website

https://www.home-assistant.io/integrations/feedreader/

Example YAML snippet

feedreader:
  urls:
    - https://home-assistant.io/atom.xml
    - https://alerts.home-assistant.io/feed.xml
    - https://raspberrypi.org/blog/feed/
    - https://wonderland.v8.1c.ru/rss/
    - https://moscow.mchs.gov.ru/deyatelnost/press-centr/operativnaya-informaciya/shtormovye-i-ekstrennye-preduprezhdeniya/rss
    - https://50.mchs.gov.ru/deyatelnost/press-centr/operativnaya-informaciya/shtormovye-i-ekstrennye-preduprezhdeniya/rss
  scan_interval:
    minutes: 30
  max_entries: 5

Anything in the logs that might be useful for us?

Debug log in attachment

Additional information

Event log and feedreader.pickle in attachment