Hello, this is an odd behavior. If I add a new task, the missing task appears, and a new task is not created; now that the disappeared task appears, I can add new tasks using the button. I suspect there might be some bug.
https://app.screencast.com/mqcHeWVOLVt0y
On another note, I wanted to highlight a few more things I noticed:
The Odoo native task planned start and the Gantt start date appear to sync; however, the native deadline and Gantt end date do not. Due to this issue, the deadline/end dates in additional views, such as Kanban and the calendar, are incorrect. Can this be fixed?
https://app.screencast.com/vPvjcizhpFz4k
The Odoo native state field and the Gantt done % field do not align, and there appears to be no way to mark a task as done from the Gantt view and vice versa. I also recommend having some way of visually identifying a task that is 100% done.
The Gantt layout does appear to save newly added columns when you exit the view, and they seem to reset back to the default when you navigate back to the Gantt view.
The Odoo native allocated time fields do not, and the Gantt effort time fields do not. It would be great if they could so we may compare actual vs. budgeted when running reports.
Besides these few items, the module is great, and I appreciate that you published this to Odoo.