Sorry for the late reply and thank you for reporting this issue.
The issue is caused by a piece of code that we use in several of our particles - Page Preloader, 3D Slider, Before/After, Fixed Header, Header Search, Headroom and Portfolio.
The code in question is
and the problem is that it is deprecated in jQuery 3
(Joomla 3 comes with jQuery 1.x while Joomla 4 comes with jQuery 3.x).
We will release a new version of all affected particles (see above) in the next couple of days. Once they are released I will update this discussion so you get notified (I hope I will not forget