Are "hallucination" from Google's "AI Summary" in Search Results very common?

Go to google.com and type in"how do I ignore AGENTS.md in codex?" --> the "AI Overview" section on the top of the search results page confidently says "To ignore AGENTS.md in Codex, you can use the codex --bypass-agents command-line flag to disable its loading, pass alternative instructions via flags, or leverage the optional AGENTS.override.md file for temporary control, but directly "ignoring" it often involves command-line overrides or creating higher-priority files rather than simple exclusion, as Codex is designed to find these instruction files by default." Then it goes on to give two examples:

In reality, it seems like Google's search AI (Gemini I suppose?) picked up the third search result on the front page which happens to be an open GitHub PR - https://github.com/openai/codex/issues/5983 - "Ability to bypass/disable AGENTS.md pipeline (CLI) #5983"

So, is the problem here that whatever is prompting Gemini is not sending the full context of the search results? (like in this case, the PR is actually open)