diff --git a/projects/CMakeLists.txt b/projects/CMakeLists.txt
index c4a2b3ed..06b582ea 100644
--- a/projects/CMakeLists.txt
+++ b/projects/CMakeLists.txt
@@ -378,6 +378,8 @@ set_tests_properties(FilteredSection-2 PROPERTIES FAIL_REGULAR_EXPRESSION "No te
 add_test(NAME ApprovalTests COMMAND ${PYTHON_EXECUTABLE} ${CATCH_DIR}/scripts/approvalTests.py $<TARGET_FILE:SelfTest>)
 set_tests_properties(ApprovalTests PROPERTIES FAIL_REGULAR_EXPRESSION "Results differed")
 
+add_test(NAME RegressionCheck-1670 COMMAND $<TARGET_FILE:SelfTest> "#1670 regression check" -c A -r compact)
+set_tests_properties(RegressionCheck-1670 PROPERTIES PASS_REGULAR_EXPRESSION "Passed 1 test case with 2 assertions.")
 
 if (CATCH_USE_VALGRIND)
     add_test(NAME ValgrindRunTests COMMAND valgrind --leak-check=full --error-exitcode=1 $<TARGET_FILE:SelfTest>)
diff --git a/projects/SelfTest/IntrospectiveTests/PartTracker.tests.cpp b/projects/SelfTest/IntrospectiveTests/PartTracker.tests.cpp
index 97423265..837d3661 100644
--- a/projects/SelfTest/IntrospectiveTests/PartTracker.tests.cpp
+++ b/projects/SelfTest/IntrospectiveTests/PartTracker.tests.cpp
@@ -189,3 +189,18 @@ TEST_CASE( "#1394 nested", "[.][approvals][tracker]" ) {
         REQUIRE(1 == 0);
     }
 }
+
+// Selecting a "not last" section inside a test case via -c "section" would
+// previously only run the first subsection, instead of running all of them.
+// This allows us to check that `"#1670 regression check" -c A` leads to
+// 2 successful assertions.
+TEST_CASE("#1670 regression check", "[.approvals][tracker]") {
+    SECTION("A") {
+        SECTION("1") SUCCEED();
+        SECTION("2") SUCCEED();
+    }
+    SECTION("B") {
+        SECTION("1") SUCCEED();
+        SECTION("2") SUCCEED();
+    }
+}