Agent stopped using Conversational Boosting

Hello,

I'm experiencing an issue with my agent in Copilot Studio. It used to work fine, but suddenly the agent stopped entering the topic that uses Conversational Boosting. When I enable Track between topics, I can see that the conversation never reaches this topic at all.

Context:

Now, I’m seeing the following unexpected message:

The bot is not using English as the language.
The entire flow is built using a customized generative node.
Orchestration was previously turned off, but now the toggle for it has disappeared from the UI.
A Knowledge base is connected to a SharePoint document library.
The agent is published and used in Microsoft Teams.
Everything worked as expected until recently.

Using generative AI to select topics / actions is only available for agents using English. Please remove all non-English languages from your agent.

This message never appeared before, and the functionality was working. Could someone please clarify:

What could have triggered this error?
Is this related to a recent Copilot Studio update?
Is there any workaround or a way to enable the generative node for non-English agents (even temporarily)?
Is it possible to restore the Conversational Boosting functionality without switching the bot to English?

Thank you in advance for your help!

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