It seems that the Gantt chart does not allow tasks with identical start and end dates—the task either doesn’t render or triggers a validation issue. However, in my use case, we frequently have single-day tasks (for example, start and expected end date both on 2025-11-03).
I reviewed your documentation here:
https://docs.svar.dev/react/gantt/api/overview/properties_overview
But I couldn’t find any clarification on whether same-day tasks are supported or if there’s a specific configuration (e.g., duration, minDuration, allowZeroDurationTasks, or milestone handling) that would allow this scenario.