A confirmed bug in Google Home forces Nest Doorbell notifications to play in an American English accent, overriding any language or dialect setting the user has configured.
The bug is tied to Gemini's voice handling layer, meaning the problem is not in the doorbell hardware or basic Home settings. It surfaces specifically at the notification announcement stage, which tells you something about where Google's assistant pipeline has a seam.
Google has acknowledged a fix is coming. The full article is worth reading for the specific reproduction conditions and any reported timeline, details that matter if you manage multi-language households or commercial deployments.
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