ros2 launch autocomplete only finds some launch files

edit

I have a package for launch files, with the following CMakeLists.txt:

cmake_minimum_required(VERSION 3.8)

project(launch_package)

if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
  add_compile_options(-Wall -Wextra -Wpedantic)
endif()

# find dependencies
find_package(ament_cmake_auto REQUIRED)
ament_auto_find_build_dependencies()

ament_auto_package(INSTALL_TO_SHARE
  launch
)

and the following launch xml file:

<?xml version="1.0"?>
<?xml-model href="http://download.ros.org/schema/package_format3.xsd" schematypens="http://www.w3.org/2001/XMLSchema"?>
<package format="3">
  <name>launch_package</name>
  <version>0.0.0</version>
  <description>Launch packages</description>
  <maintainer email="my@email.com">name</maintainer>
  <license>MIT</license>

<buildtool_depend>ament_cmake</buildtool_depend>

  <test_depend>ament_lint_auto</test_depend>
  <test_depend>ament_lint_common</test_depend>

  <exec_depend>ros2launch</exec_depend>
  <exec_depend>package1</exec_depend>
  <exec_depend>package2</exec_depend>
  <exec_depend>package3</exec_depend>
  <exec_depend>package4</exec_depend>

  <export>
    <build_type>ament_cmake</build_type>
  </export>
</package>

Further, I have a launch folder with different launch files. After I build and source the workspace, I run ros2 launch launch_package and press tab for autocomplete, I see 2 of the launch files. All other launch files are not recognized from autocomplete. However, I can still run the launch files by typing the names by hand. I also find all the files in the install folder. What coul be the reason that I do not see parts of the launch files in autocomplete, even though they reside in the same folder?