It seems like $response can also be of type array and array and array and array<mixed,array|mixed|null>; however, parameter $message of BotMan\BotMan\Messages\C...ons\Conversation::say() does only seem to accept BotMan\BotMan\Messages\Outgoing\Question|string, maybe add an additional type check?
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Ignorable by Annotation
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If this is a false-positive, you can also ignore this issue in your code via the ignore-type annotation