diff --git a/clang-tools-extra/clangd/TUScheduler.cpp b/clang-tools-extra/clangd/TUScheduler.cpp
--- a/clang-tools-extra/clangd/TUScheduler.cpp
+++ b/clang-tools-extra/clangd/TUScheduler.cpp
@@ -919,7 +919,9 @@
                       llvm::unique_function<void()> Action) {
   if (!PreambleTasks)
     return Action();
-  PreambleTasks->runAsync(Name, std::move(Action));
+  auto ActionWithCtx = [Ctx = Context::current().clone(),
+                        Action = std::move(Action)]() mutable { Action(); };
+  PreambleTasks->runAsync(Name, std::move(ActionWithCtx));
 }
 
 void TUScheduler::runWithAST(
diff --git a/clang-tools-extra/clangd/unittests/TUSchedulerTests.cpp b/clang-tools-extra/clangd/unittests/TUSchedulerTests.cpp
--- a/clang-tools-extra/clangd/unittests/TUSchedulerTests.cpp
+++ b/clang-tools-extra/clangd/unittests/TUSchedulerTests.cpp
@@ -688,6 +688,24 @@
   S.run("add 2", [&] { Counter += 2; });
   ASSERT_TRUE(S.blockUntilIdle(timeoutSeconds(10)));
   EXPECT_EQ(Counter.load(), 3);
+
+  Notification OutsideCtxDestroyed;
+  Notification ScopeExit;
+  Counter.store(0);
+  {
+    WithContextValue Context(llvm::make_scope_exit([&] {
+      ++Counter;
+      ScopeExit.notify();
+    }));
+    S.run("props context", [&] {
+      OutsideCtxDestroyed.wait();
+      // scope exit shouldn't be called until run finishes.
+      EXPECT_THAT(Counter.load(), 0);
+    });
+  }
+  OutsideCtxDestroyed.notify();
+  ScopeExit.wait();
+  EXPECT_THAT(Counter.load(), 1);
 }
 
 TEST_F(TUSchedulerTests, TUStatus) {