diff --git a/cameleer3-server-app/src/main/java/com/cameleer3/server/app/diagram/ElkDiagramRenderer.java b/cameleer3-server-app/src/main/java/com/cameleer3/server/app/diagram/ElkDiagramRenderer.java
index b3bec6ec..76b5067f 100644
--- a/cameleer3-server-app/src/main/java/com/cameleer3/server/app/diagram/ElkDiagramRenderer.java
+++ b/cameleer3-server-app/src/main/java/com/cameleer3/server/app/diagram/ElkDiagramRenderer.java
@@ -309,8 +309,22 @@ public class ElkDiagramRenderer implements DiagramRenderer {
             if (ctx.compoundNodeIds.contains(re.getSource()) && isDescendantOf(targetElk, sourceElk)) {
                 continue;
             }
-            // Skip edges that cross ELK root boundaries
-            if (getElkRoot(sourceElk) != getElkRoot(targetElk)) continue;
+            // Skip edges that cross ELK root boundaries — but allow continuation
+            // edges that exit a compound (source inside compound, target outside)
+            if (getElkRoot(sourceElk) != getElkRoot(targetElk)) {
+                // Allow if source and target share the same grandparent (main root)
+                // i.e., one is inside a compound and the other is a sibling
+                ElkNode sourceRoot = getElkRoot(sourceElk);
+                ElkNode targetRoot = getElkRoot(targetElk);
+                boolean sameGrandparent = sourceRoot.getParent() != null
+                        && targetRoot.getParent() != null
+                        && sourceRoot.getParent() == targetRoot.getParent();
+                boolean sourceExitsCompound = sourceRoot.getParent() != null
+                        && targetRoot == sourceRoot.getParent();
+                boolean targetExitsCompound = targetRoot.getParent() != null
+                        && sourceRoot == targetRoot.getParent();
+                if (!sameGrandparent && !sourceExitsCompound && !targetExitsCompound) continue;
+            }
 
             ElkEdge elkEdge = ctx.factory.createElkEdge();
             elkEdge.setContainingNode(findCommonParent(sourceElk, targetElk));