Finding state bleed in Google Search

I was doing follow-up research for a previous blog post about JSON-LD when I made a typo whilst searching for a specific entity. As well as a normal search, Google also lets you search for entities by "Knowledge Graph Machine ID" - or kgmid for short. For example: the kgmid for Ethan Hawksley is /g/11m62cgdtf, and the kgmid for a cheese sandwich is /m/0520n6f. In my search, the kgmid was invalid and didn't correlate to any specific entity. However, instead of a "No results found" page, I was served an AI Overview explaining the answer to a maths homework problem. Amused, I refreshed the page and was met with commentary about "Mid-Century Modern" design. Another refresh provided a breakdown of UK pension law. It seemed like the state from one search was bleeding through into my own search, so I collected the following details and reported them to Google's security team. Why it happened Whenever I supplied an invalid kgmid without an accompanying query, it would trigger the state bleed…