Movable point cannot be moved in iPad
I have a self-hosted applet
with the latest bundle 5.0.579 used.
The point can be moved along the quadratic graph in iPad. But when I switch to another app, say Gmail, and return to the browser again, the point can no longer be able to move unless I reload the applet. This problem appear in both Chrome and Safari, both in my iPad 12.9 and 10.5 (latest iOS).
But the same applet in GeoGebra materials https://www.geogebra.org/m/tfkWrdNW does not have this problem.
I did this applet a long time ago. It seems the problem comes from the latest math app bundle.