On 3 September 2026, SEO consultants noticed that AI Mode answers generated by Gemini 3.8 Flash, the model added the previous day to the menu for Google AI Pro and Ultra subscribers, no longer showed any link or citation on informational queries (Search Engine Roundtable). On 4 September, Robby Stein, vice-president of product for Google Search, acknowledged a malfunction and announced a fix; that same morning, the links reappeared (Search Engine Land). The episode lasted under 48 hours and only affected paying subscribers, but it shows that a site can vanish from Google's AI answers without having changed anything.
The facts
- On 2 September 2026, Google added Gemini 3.8 Flash to the AI Mode model menu, reached through the “+” icon in the “Ask anything” bar, for Google AI Pro and Ultra subscribers worldwide. It is the third Flash model in six weeks, three weeks after Gemini 3.7 Flash, which arrived in AI Mode on 14 August. Users of the free tier do not choose their model and receive the default answer (Search Engine Journal).
- On 3 September, Gagan Ghotra posted on X a series of top-of-funnel searches, none of which showed a link; Glenn Gabe compared the default model and Gemini 3.8 Flash side by side and called on Robby Stein to respond. Barry Schwartz relayed the finding that same morning on Search Engine Roundtable, adding that he did not understand the cause (Search Engine Roundtable).
- On 4 September, Robby Stein replied on X: “Hey, thanks for flagging. This isn't working as intended, and we'll roll out a fix soon.” No date, no scope and no technical explanation came with the message. Glenn Gabe observed that same morning that Gemini 3.8 Flash was providing links again, with screenshots to back it up (Search Engine Land).
- No measured citation rate has been published for either model: the evidence consists of screenshots of individual queries, with no sample and no reproducible method. Any percentage drop circulating on the subject should be checked before being repeated (Relevant Audience).
Why does a bug fixed in two days matter for the SEO of a Luxembourg site?
Because the model answering in AI Mode changes on Google's calendar, with no connection to what happens on websites. Search Engine Journal traces the pace: Gemini 3 Pro as an option in November 2025, Gemini 3 Flash as the default in December, Gemini 3.5 Flash as the worldwide default at I/O in May 2026, Gemini 3.7 Flash in the menu on 14 August, Gemini 3.8 Flash on 2 September. The two previous Flash generations went from optional to default; if 3.8 Flash follows the same path, it will reach the free tier, and Google's help page on the model menu still only mentions “Fast” and “Pro”. A citation survey run in mid-August on 3.7 Flash and one run today on 3.8 Flash compare two models: the gap between them says nothing about the site's content.
The second lesson concerns the nature of the evidence. Google gave no cause, the fix has no version number and no announced scope, and the SEO community had nothing but screenshots to go on. Search Engine Land recalls that Google had promised to link more, in a way that supports the wider web; for a day and a half, version 3.8 Flash had stopped doing so. For a publisher, this kind of episode stays invisible in the usual tools: the Search Console report opened on 31 August shows impressions in Google's AI surfaces, without clicks, and with a lag that makes it impossible to date a variation or attribute it to a specific model.
The real scope should temper the reading. Only paying subscribers who had manually selected the model saw answers without links, and AI Mode accounts for only a fraction of Google searches. Traffic to most Luxembourg sites therefore did not move. What did move is the demonstration that a presence in AI answers depends on a component that neither the publisher nor its agency controls, and that Google can change three times in six weeks.
AIxH's view
A channel whose behaviour changes with the model calls for tracking kept separate from standard SEO reporting. Our SEO agency in Luxembourg records, for every AI visibility survey, the date, the model selected and the subscription tier of the account used, then reconciles those surveys with Search Console's AI impressions before drawing any conclusion. The foundation remains organic search, measurable and stable from one day to the next: rankings, clicks, conversions. Visibility in AI answers is built on top of that foundation, with its own indicators and an accepted tolerance for volatility. A client who asks us why their citations dropped this week will first get a question back: on which model, and from which account?