diff --git a/Vendor/swift-markdown-engine/Sources/MarkdownEngine/TextView/Coordinator/NativeTextViewCoordinator+Restyling.swift b/Vendor/swift-markdown-engine/Sources/MarkdownEngine/TextView/Coordinator/NativeTextViewCoordinator+Restyling.swift
index 7133867..4b3c152 100644
--- a/Vendor/swift-markdown-engine/Sources/MarkdownEngine/TextView/Coordinator/NativeTextViewCoordinator+Restyling.swift
+++ b/Vendor/swift-markdown-engine/Sources/MarkdownEngine/TextView/Coordinator/NativeTextViewCoordinator+Restyling.swift
@@ -185,6 +185,13 @@ extension NativeTextViewCoordinator {
             previousActiveTokenIndices = activeTokenIndices
             previousCaretLocation = finalSelection.location
             previousSelectedRange = finalSelection
+
+            // FIX: seed cachedCodeBlockTokens on the programmatic load path too —
+            // it was previously only populated by the AppKit text-delegate
+            // callbacks (textDidChange / selection-changed), so code-block
+            // overlays (line-number gutters, the built-in copy button) stayed
+            // empty on a cold document open until the user's first keystroke.
+            updateCodeBlockSelection(textView: textView, parsed: parsed)
         }
 
         // Reconcile wide-table overlays after layout settles.