Google has confirmed a bug: since switching AI Mode to the Gemini 3.8 Flash model in early September 2026, the feature has stopped showing links and citations in most of its answers - especially on broad, top-of-funnel queries. A fix is coming, but Google hasn't said when.
If your GEO monitoring shows a sudden drop in AI Mode citations this month, this bug is the most likely explanation - not a change in how your content is evaluated.
The rollout and the bug
On September 1-2, 2026, Google began rolling out Gemini 3.8 Flash inside AI Mode - the third Flash-model release in six weeks, available to Google AI Pro and Ultra subscribers. Within days, search marketers started noticing that AI Mode answers running on 3.8 Flash came back with no source links at all, even on queries that reliably produced 3-5 citations before the switch.
Performance marketer Gagan Ghotra was first to document it publicly, posting dozens of AI Mode searches on X with zero citations across the board. Analyst Glenn Gabe followed up with a direct side-by-side comparison on September 3: the default model cited sources normally, 3.8 Flash produced the same answer with none.
Google's official statement
Search Engine Roundtable's Barry Schwartz broke the story on September 3. The next day, Robby Stein - VP of Product for Google Search - responded directly on X: "This isn't working as intended, and we'll roll out a fix soon."
That's an official acknowledgment, not community speculation. But the statement gives no timeline and no detail on what the fix will look like - whether it's a model rollback, a patch to the citation logic, or something else.
Who this actually affects
One detail gets lost in most coverage of this story: Gemini 3.8 Flash in AI Mode is only available to Google AI Pro and Ultra subscribers. The free tier of AI Mode runs a different model and isn't affected by this bug at all.
That doesn't make it a niche issue - Pro/Ultra subscriber numbers keep growing, and that segment tends to run more complex, multi-step queries, which is exactly the query type where citations mattered most before this bug hit.
What it means for your GEO tracking
Generative Engine Optimization is about getting your content cited inside AI answers, not just ranked in organic results. If your citation-tracking shows a sharp drop in early September 2026, that's the expected fallout from this bug - not evidence that your content stopped qualifying.
What to actually do right now:
- Don't overhaul your content strategy based on one week of anomalous data.
- Check queries manually on an AI Pro/Ultra account if you have access - that's the only reliable way to see the bug directly.
- Keep working on signals that matter regardless of which model is running: direct, extractable answers early in each section, specific data instead of vague claims, solid E-E-A-T signals.
- Watch official Google Search channels (Robby Stein's X account, the Search Central blog) for the fix announcement.
Why this is different from the broader AI Overviews trend
It's worth separating this from the well-documented long-term drop in organic CTR on AI-Overview-heavy queries. That's a structural shift Google has no plans to reverse. The lack of citations specifically on the 3.8 Flash model is a different thing entirely - a confirmed bug in one release that Google has already admitted is broken behavior, not an intentional algorithm change.
The practical difference matters: the long-term CTR trend calls for diversifying traffic sources and optimizing for citation in general. This specific bug just calls for patience - don't draw conclusions about your content's quality from one anomalous week of data.
A simple monitoring checklist while you wait
- Pick 5-10 queries your site was previously cited for in AI Mode - reuse the exact phrasing from your existing GEO tracking, don't invent new ones.
- Check them every 3-4 days on an AI Pro/Ultra account, ideally at the same time of day to reduce noise from response variation.
- Track not just whether citations appear, but how many and where in the answer - Google may fix this gradually across query types rather than all at once.
- Track broad informational queries and narrower transactional ones separately - early reports suggest narrower commercial queries may be less affected than broad informational ones.
If citations haven't returned 3-4 weeks after September 4, 2026, it's worth submitting feedback through Search Console or replying with a concrete example to Robby Stein's thread on X. Confirmed Google bugs tend to get prioritized faster when the company has specific, reproducible cases from users rather than general complaints.
FAQ
What happened to Gemini 3.8 Flash in AI Mode? After AI Mode switched to the Gemini 3.8 Flash model on September 1-2, 2026, it largely stopped showing source citations in its answers, especially for broad informational queries. Google confirmed this as a bug on September 4, 2026.
Who is affected by this bug? Only Google AI Pro and Google AI Ultra subscribers - they're the only ones who get Gemini 3.8 Flash in AI Mode. The free AI Mode tier runs a different model and isn't affected.
When will Google fix it? No date has been given. Robby Stein, VP of Product for Google Search, confirmed the bug on September 4, 2026, and promised a fix soon without specifying a timeline.
Should I change my GEO strategy because of this bug? No, not based on this alone. It's a confirmed temporary bug tied to one model release, not a permanent change to how citations work. It's better to wait for the official fix than to draw conclusions from one anomalous week.
How do I check if my site is affected? The only reliable method is to manually test relevant queries in AI Mode on an account with a Google AI Pro or Ultra subscription and check whether source citations appear in the responses.
For more on building visibility inside AI answers long-term, see our guide to Generative Engine Optimization and our data breakdown on the AI Overviews CTR drop.
