Summary

Customers reports that after the agent model upgrade to gemini-3-flash-preview, their agent hallucinates.

e.g:

• can't search Jira properly, and gives incorrect information.

Switching back to the old model fixes it immediately.

Reproduction

Same agent, same query — different results depending on model:

• Old model request ID: works correctly

• New model request ID: hallucinates, incorrect Jira search results