Microsoft has released a Windows 10 update that fixes multiple bugs in Windows 10, version 1909 and version 1903. The optional non-security KB4550945 update was published as part of the optional monthly C release and it only comes with Windows 10 quality improvements. The update will be automatically installed automatically when checking for updates using Windows Update and you can also manually install it from the Microsoft Update Catalog. Additional info on optional updates starting May 2020 can be found in a Windows message center announcement regarding the timing for upcoming Windows optional C and D releases.
Source: https://www.bleepingcomputer.com/news/microsoft/windows-10-kb4550945-update-released-with-windows-update-fixes/