Using mutate inside debounce not triggering the API call?

export function useDebounce<T extends (...args: Parameters<T>) => void>(
  callback: T,
  delay = 300,
  dependencies: React.DependencyList = []
): (...args: Parameters<T>) => void {
  const timeoutRef = useRef<NodeJS.Timeout | null>(null);

  useEffect(() => {
    return () => {
      if (timeoutRef.current) {
        clearTimeout(timeoutRef.current);
      }
    };
  }, [dependencies]);

  const debouncedCallback = useCallback(
    (...args: Parameters<T>) => {
      if (timeoutRef.current) {
        clearTimeout(timeoutRef.current);
      }

      timeoutRef.current = setTimeout(() => {
        callback(...args);
      }, delay);
    },
    [callback, delay, ...dependencies]
  );

  return debouncedCallback;
}

I made a custom hook for debouncing in Next. When I was using this hook with mutate from useSWRImmutable, the problem was that the refetch was never occurring.

This is how I was using the hook

const handleMutate = useCallback(async () => {
  await mutate();
}, [mutate]);

const debouncedMutate = useDebounce(handleMutate, 5000, [mutate]);

Then whenever I called debouncedMutate from anywhere the refetch call never occurred. I waited for a minute or more, then I even tried to change the time limit to 100ms but the call still did not occur.

export function useDebounceFunction<T extends (...args: unknown[]) => void>(
    fn: T,
    delay: number
) {
    const timeoutRef = useRef<NodeJS.Timeout | null>(null);
    const fnRef = useRef(fn);

    fnRef.current = fn;

    return useCallback(
        (...args: Parameters<T>): void => {
            if (timeoutRef.current) {
                clearTimeout(timeoutRef.current);
            }

            timeoutRef.current = setTimeout(() => {
                fnRef.current(...args);
            }, delay);
        },
        [delay]
    );
}

Then when I started to use this custom hook, the issue was resolved, can anyone tell me why this was happening even though I was doing the same thing with useDebounce just using the useCallback outside the useDebounce hook?

I was using the useSWRImmutable inside a zustand store to fetch API and store the data in the store.