diff --git a/folly/Executor.h b/folly/Executor.h
index fc8e9321fc1..c5104b370fa 100644
--- a/folly/Executor.h
+++ b/folly/Executor.h
@@ -341,7 +341,11 @@ class Executor {
 
   template <typename F>
   FOLLY_ERASE static void invokeCatchingExns(char const* p, F f) noexcept {
+#if 0
     catch_exception(f, invokeCatchingExnsLog, p);
+#else
+    f();
+#endif
   }
 
  protected:
diff --git a/folly/executors/test/SerialExecutorTest.cpp b/folly/executors/test/SerialExecutorTest.cpp
index 121fa80c2b7..7a1e04a3819 100644
--- a/folly/executors/test/SerialExecutorTest.cpp
+++ b/folly/executors/test/SerialExecutorTest.cpp
@@ -192,7 +192,10 @@ TYPED_TEST(SerialExecutorTest, RecursiveAddInline) {
   recursiveAddTest<TypeParam>(folly::InlineExecutor::instance());
 }
 
-TYPED_TEST(SerialExecutorTest, ExecutionThrows) {
+// MB-44253: Disabled - unhandled exceptions in tasks are no longer caught
+// (invokeCatchingExns is a no-op on this branch), so this test would
+// std::terminate.
+TYPED_TEST(SerialExecutorTest, DISABLED_ExecutionThrows) {
   auto executor = TypeParam::create();
 
   // an empty Func will throw std::bad_function_call when invoked,
diff --git a/folly/executors/test/ThreadedExecutorTest.cpp b/folly/executors/test/ThreadedExecutorTest.cpp
index 5aefa9b4e4e..4aa69827a13 100644
--- a/folly/executors/test/ThreadedExecutorTest.cpp
+++ b/folly/executors/test/ThreadedExecutorTest.cpp
@@ -39,7 +39,10 @@ TEST_F(ThreadedExecutorTest, example) {
   EXPECT_EQ("42", ret);
 }
 
-TEST_F(ThreadedExecutorTest, exception) {
+// MB-44253: Disabled - unhandled exceptions in tasks are no longer caught
+// (invokeCatchingExns is a no-op on this branch), so this test would
+// std::terminate.
+TEST_F(ThreadedExecutorTest, DISABLED_exception) {
   folly::ThreadedExecutor x;
   x.add([] { throw std::runtime_error("This should not crash the program"); });
 }