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
@@ -44,6 +44,7 @@
 #include "TUScheduler.h"
 #include "Cancellation.h"
 #include "Compiler.h"
+#include "Context.h"
 #include "Diagnostics.h"
 #include "GlobalCompilationDatabase.h"
 #include "Logger.h"
@@ -919,7 +920,11 @@
                       llvm::unique_function<void()> Action) {
   if (!PreambleTasks)
     return Action();
-  PreambleTasks->runAsync(Name, std::move(Action));
+  PreambleTasks->runAsync(Name, [Ctx = Context::current().clone(),
+                                 Action = std::move(Action)]() mutable {
+    WithContext WC(std::move(Ctx));
+    Action();
+  });
 }
 
 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 +688,15 @@
   S.run("add 2", [&] { Counter += 2; });
   ASSERT_TRUE(S.blockUntilIdle(timeoutSeconds(10)));
   EXPECT_EQ(Counter.load(), 3);
+
+  Notification TaskRun;
+  Key<int> TestKey;
+  WithContextValue CtxWithKey(TestKey, 10);
+  S.run("props context", [&] {
+    EXPECT_EQ(Context::current().getExisting(TestKey), 10);
+    TaskRun.notify();
+  });
+  TaskRun.wait();
 }
 
 TEST_F(TUSchedulerTests, TUStatus) {