error:Unable to preventDefault inside passive event listener invocation



It may or may not be related to Gantt configuration, but it is hard to suggest what might be wrong as I don’t see your code.

Please, add your configuration in the following snippet and make sure that the issue is reproduced there:
Then, click on the Share button and send me the link.
Or send me a ready demo with all the necessary Javascript and CSS files so that I can reproduce the issue locally.