Microsoft has released a new servicing stack update KB4541338 for PCs running Windows 10 version 1903 and 1909. According to Microsoft, as the prerequisite to install this new update, you must have installed the February 11, 2020 SSU update KB4538674.
The changes that the Servicing stack update has brought include:
This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) makes sure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates.
This update will be downloaded and installed automatically. You don’t have to restart your computer after you apply this update. If you want to manually download the update, click here.