Hi Gian Piero Truccolo,
Greetings from Syncfusion.
We have checked the reported query , If you have set the Gantt control ValidationMode as Auto the predecessor nodes will adjust automatically. In manual case, we need to adjust manually with respect to predecessor nodes, this is our Gantt control behavior.
Can you please provide the detailed information on the reported query?
Are you expecting to adjust the predecessor nodes automatically in manual mode while creating predecessor relationship between nodes dynamically?
Regards,
Sridevi S.