Gemini 3.8 Flash TTS sometimes adds unscripted speech and long silences

Example responseId: kRTUat-ULr-AytMPw_Cu6A
Model: gemini-3.8-flash-tts
Request started: 2026-10-18T00:36:33.578Z (UTC)
HTTP status: 200
finishReason: STOP

Returned 152.68 seconds of audio, including approximately 122 seconds of silence, repeated input, and an unscripted French answer absent from the supplied transcript.

Two more identical requests which did not exhibit this strange behaviour:

  • eBTUaq_ZHovEytMPgcaGo..
  • hRTUav_QA8mRytMP6PXBk..
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