NextJs >=15.2.2 broke server action calls from client component

Hello everyone,

I'm facing a problem that appeared when updating NextJs from 15.2.1 to 15.2.2 and higher. I reproduced the problem on Windows and Linux.

Details :

Because I need a client information (the current datetime of the user), I need to fetch data from a client component. Since NextJs 15.2.2, my data fetching worked like a charm, but now I have a regression.|

I based my sourcecode on the following part of the documentation.

I'm using useEffect and a server action to fetch data (maybe not the sexiest way to fetch data ^^). Below, you'll find the small part of the client component that stopped working with this NextJs update (without changing anything else) :

Source code :


const fetchEvents = useCallback(async () => {
    try {
      const localDateString = new Date().toLocaleString();
      const filters = {
        participatingonly: isParticipatingOnly,
        showoldevents: isShowOldEvents,
      };
      
      console.log('before');
      //const newEvents = await fetch('/api/web/events')

      const newEvents = await getFilterdEvents(
        currentSearch, 
        localDateString, 
        filters
      );
      console.log('after');
      setEvents(newEvents);
 
    } catch (error) {
      console.error("Error fetching events:", error);
    }
  }, [currentSearch, isShowOldEvents, isParticipatingOnly]);

  useEffect(() => {
    setIsLoading(true);
    async function loadData() {
      try {
        await fetchEvents();
      } finally {
        setIsLoading(false);
      }
    };
    loadData();
    console.log('end of useEffect');
  }, [fetchEvents]);

In the source code above, console.log('before'); hit (I see before in the browser console), but I don't know why getFilterdEvents is never called, console.log('after'); is never hit, but console.log('end of useEffect'); at the end of useEffect is visible in the browser.

No server or client error, no warning. If I add for example a console.log inside the fetchEvents, the fast refresh make it works once and if I replace the server action call by for example a fetch to an API endpoint it works.

What was done in Next 15.2.2 to make it buggy ? Can you help me please ? :)