If the prompt is related to something happened after the cut off date for gemini 2.5 (flash /pro) the model refuses to search altogether.
For example:
Search Which ceo were present to the second inauguration ceremony of president trump
Answer:
It appears there might be some confusion regarding the question. Donald Trump had one presidential inauguration ceremony on January 20, 2017, as he served one term as President of the United States (2017-2021) and was not re-elected for a second term. Therefore, there has been no second inauguration ceremony for him ....
It takes a lot of convincing to make it search
I've passed this on to the team.