When I am testing my bot it always goes to fallback, and then escalate. If i disable the topics the bot works fine and finds the right information and responds with generative answer. But these are needed for publish, which then means it wont respond.
I havent heard this bug reported yet, could you please open a support ticket?
I noticed this happen to me recently too for some reason, since the UI changed.
I put together a work around to stop it sending the rephrase response / going to escalate that can be found here: https://powerusers.microsoft.com/t5/Topic-Creation-Management/Fallback-Topic-is-triggering-after-Conversational-Boosting/m-p/2782204#M1950
Pretty much I deduced that even though it goes into Fallback even if it finds an answer, the FallbackCount can be used in a condition to redirect the flow since it seems that FallbackCount is set to 0 if there is an answer.
I fully expect that this is a bug that was introduced with the recent changes and it will likely get fixed very soon, but if you don't want to recreate the copilot, this is an initial quick fix. You may want to keep the escalate topic in the flow compared what is in the screenshot I have in that thread. I removed it as I don't have use for it as of yet.
Hope this helps 🙂
What are the topics you are disabling? Do they have adequate training phrases (10-15)?