diff --git a/src/controller/WorkbenchNavController.cpp b/src/controller/WorkbenchNavController.cpp
index 4739b3b..2fabdcb 100644
--- a/src/controller/WorkbenchNavController.cpp
+++ b/src/controller/WorkbenchNavController.cpp
@@ -1,5 +1,7 @@
 #include "WorkbenchNavController.hpp"
 
+#include <QMetaObject>
+
 #include "dto/NavDto.hpp"
 
 namespace geopro::controller {
@@ -10,8 +12,8 @@ using data::Workspace;
 WorkbenchNavController::WorkbenchNavController(data::IProjectRepository& repo, QObject* parent)
     : QObject(parent), repo_(repo) {}
 
-namespace {
 // RAII：进入公共导航操作时置忙（驱动等待光标），任何返回路径都复位——保证 busyChanged 配平。
+// 命名（非匿名）以匹配 controller 的 friend 声明，从而在析构时排空挂起的勾选请求。
 struct BusyGuard {
     WorkbenchNavController* self;
     bool* busy;
@@ -20,11 +22,16 @@ struct BusyGuard {
         emit self->busyChanged(true);
     }
     ~BusyGuard() {
+        WorkbenchNavController* ctrl = self;  // 取本地副本：lambda 不能捕获成员
         *busy = false;
-        emit self->busyChanged(false);
+        emit ctrl->busyChanged(false);
+        // 触发源是延迟合并发射，可能落在嵌套事件循环里：用队列调用在调用栈/嵌套循环展开后再排空，
+        // 那时 busy_ 已可靠为 false，重放才会真正执行（lambda 捕获的 ctrl 生命周期与应用一致，安全）。
+        if (ctrl->checkedTmsPending_)
+            QMetaObject::invokeMethod(
+                ctrl, [ctrl] { ctrl->drainPendingCheckedTms(); }, Qt::QueuedConnection);
     }
 };
-}  // namespace
 
 void WorkbenchNavController::start() {
     if (busy_) return;
@@ -51,6 +58,10 @@ void WorkbenchNavController::loadProjectsAndStructure() {
     }
     lastProjects_ = ps.value.rows;
     tmExceptionCache_.clear();
+    currentParentId_.clear();              // 切项目/工作空间重置选中态（spec §6）
+    currentParentConfType_ = 0;
+    checkedTmsPending_ = false;            // 丢弃跨项目的陈旧挂起重放
+    pendingCheckedTms_.clear();
     QString curP;
     if (!ps.value.rows.empty()) {
         const auto& first = ps.value.rows.front();
@@ -107,6 +118,10 @@ void WorkbenchNavController::switchProject(const QString& projectId) {
     }
     lastStructNodes_ = st.value;
     tmExceptionCache_.clear();
+    currentParentId_.clear();              // 切项目/工作空间重置选中态（spec §6）
+    currentParentConfType_ = 0;
+    checkedTmsPending_ = false;            // 丢弃跨项目的陈旧挂起重放
+    pendingCheckedTms_.clear();
     emit structureLoaded(QString::fromStdString(currentProjectName_), st.value);
 }
 
@@ -166,7 +181,11 @@ void WorkbenchNavController::loadMoreFiles() {
 }
 
 void WorkbenchNavController::setCheckedTms(const QStringList& tmObjectIds) {
-    if (busy_) return;
+    if (busy_) {                              // 触发源是延迟合并发射，可能落在别的同步操作的嵌套事件循环里：
+        pendingCheckedTms_ = tmObjectIds;     // 不丢弃，记下最新一次请求，待空闲重放
+        checkedTmsPending_ = true;
+        return;
+    }
     BusyGuard guard(this, &busy_);
     auto nameOf = [this](const std::string& id) -> std::string {
         for (const auto& n : lastStructNodes_)
@@ -198,6 +217,12 @@ void WorkbenchNavController::setCheckedTms(const QStringList& tmObjectIds) {
     emit exceptionTreeLoaded(groups, total);
 }
 
+void WorkbenchNavController::drainPendingCheckedTms() {
+    if (busy_ || !checkedTmsPending_) return;
+    checkedTmsPending_ = false;             // 先清标志再重放，避免重入自旋
+    setCheckedTms(pendingCheckedTms_);      // 此时 busy_=false，会正常执行
+}
+
 void WorkbenchNavController::selectDataset(const QString& dsObjectId) {
     if (dsObjectId.isEmpty() || busy_) return;
     BusyGuard guard(this, &busy_);
diff --git a/src/controller/WorkbenchNavController.hpp b/src/controller/WorkbenchNavController.hpp
index 2f28103..136fe78 100644
--- a/src/controller/WorkbenchNavController.hpp
+++ b/src/controller/WorkbenchNavController.hpp
@@ -45,10 +45,14 @@ signals:
     void loadFailed(const QString& stage, const QString& message);
 
 private:
+    friend struct BusyGuard;          // 允许在 guard 析构时排空挂起的勾选请求
     void loadProjectsAndStructure();  // start + switchWorkspace 共用
+    void drainPendingCheckedTms();    // 空闲后重放最近一次被挂起的勾选集
 
     data::IProjectRepository& repo_;
     bool busy_ = false;
+    bool checkedTmsPending_ = false;
+    QStringList pendingCheckedTms_;
     std::vector<data::ProjectSummary> lastProjects_;
     std::string currentWorkspaceId_, currentProjectId_, currentProjectName_, currentCrsCode_;
     std::string currentParentId_;