From ca808c7a4f0aa76f2bb84f5230bff66ee394a62f Mon Sep 17 00:00:00 2001
From: kolaente <k@knt.li>
Date: Mon, 2 Mar 2026 13:44:09 +0100
Subject: [PATCH] fix(gantt): only set hasDerivedDates when children have
 actual dates

---
 frontend/src/helpers/ganttTaskTree.ts | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/frontend/src/helpers/ganttTaskTree.ts b/frontend/src/helpers/ganttTaskTree.ts
index 9f07b6b74..5529ceaca 100644
--- a/frontend/src/helpers/ganttTaskTree.ts
+++ b/frontend/src/helpers/ganttTaskTree.ts
@@ -65,12 +65,13 @@ export function buildGanttTaskTree(tasks: Map<number, ITask>): GanttTaskTreeNode
 		// Calculate derived dates for dateless parents
 		let derivedStartDate: Date | null = null
 		let derivedEndDate: Date | null = null
-		const hasDerivedDates = isParent && !task.startDate && !task.endDate && !task.dueDate
+		let hasDerivedDates = false
 
-		if (hasDerivedDates) {
+		if (isParent && !task.startDate && !task.endDate && !task.dueDate) {
 			const dates = collectChildDates(childIds, tasks, childrenMap)
 			derivedStartDate = dates.minStart
 			derivedEndDate = dates.maxEnd
+			hasDerivedDates = derivedStartDate !== null || derivedEndDate !== null
 		}
 
 		result.push({