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I created an incident:
https://www.syncfusion.com/support/directtrac/incidents/268281
The response was to use that example, I tried to use it but when I double click on a task, add a new dependency, nothing is reflected on the gantt(the issue there is fixed, but when you need to add a new dependency it does not work), I saw that in your example are using 18.1.36-beta, and I was using the version 17.4.51 and this doesn't work. I downloaded the service pack 17.4.0.46 and doesn't work too.
The bug in that incident was because we were using version: 17.3.28, but now that we updated the problem is with adding a new one