fix(compiler): preserve server-only loader text and control blocks

packages/compiler/src/codegen.ts

@@ -417,15 +417,17 @@ function substituteReactiveText(
   dynamicExpressions?: string[],
 ): string {
   const text = substituteTMarkers(raw);
-  if (!reactive || reactive.stateNames.size === 0) return text;
+  if (!reactive) return text;
   return text.replace(/\{([^{}]+)\}/g, (whole, inner: string) => {
     const expr = inner.trim();
-    if (expr.startsWith("t:") || !exprRefsState(expr, reactive.stateNames)) return whole;
+    const clientReactive = exprRefsState(expr, reactive.stateNames);
+    if (expr.startsWith("t:")) return whole;
     if (exprRefsState(expr, reactive.runtimeStateNames) && dynamicExpressions) {
       dynamicExpressions.push(`\${__wrnexusEscapeHtml(${expr})}`);
       const sentinel = `\x00WRNEACH${dynamicExpressions.length - 1}\x00`;
-      return `<span data-text="${attrEscape(expr)}">${sentinel}</span>`;
+      return clientReactive ? `<span data-text="${attrEscape(expr)}">${sentinel}</span>` : sentinel;
     }
+    if (!clientReactive) return whole;
     let value: unknown;
     try {
       value = new Function("with(this){return (" + expr + ");}").call(reactive.scope);
@@ -660,6 +662,19 @@ function renderNode(
   // templateEscape, swapped for its real `${…}` code after escaping.
   if (node.type === "each" || node.type === "if") {
     loops.push(node.type === "each" ? compileEachExpr(node) : compileIfExpr(node));
+    const conditions =
+      node.type === "each"
+        ? [node.list]
+        : node.branches.flatMap((branch) => (branch.cond ? [branch.cond] : []));
+    // Server-only loader values are not serialized into browser state. Their
+    // controls must not be re-evaluated by a surrounding component's hydration.
+    if (
+      reactive &&
+      conditions.some((condition) => exprRefsState(condition, reactive.runtimeStateNames)) &&
+      !conditions.some((condition) => exprRefsState(condition, reactive.stateNames))
+    ) {
+      return `\x00WRNEACH${loops.length - 1}\x00`;
+    }
     const definition =
       node.type === "each"
         ? {