Dears,
while we trying to create a number of tasks in a project after we refresh the page, tasks that were created basically disappears, happened more than once.
could you please guide us on this matter?
Strange I can not reproduce it on our demo site.
https://odoo-gantt.bryntum.com
What version are you currently using? It could be that the backend did not save the task fully before you refreshed, but I am not sure.