1903 SSU/CU (build 18362.86): https://forums.mydigitallife.net/threads/windows-10-hotfix-repository.57050/page-396#post-1521174
You can check to see what is in fast, slow and release preview with the program UUPDL. In fast you'll be find 18890.
Maybe because they handle things differently now? Like here: https://forums.mydigitallife.net/threads/windows-10-hotfix-repository.57050/page-387#post-1514996
I think they can be uninstalled if the previous patches are still available and not cleaned up with dism or uninstalled from Control Panel. For a technical explanation, the post from @abbodi1406 to which @Enthousiast made reference makes perfect sense.
I have exactly the same problem. Lenoto T440s with latest drivers. I have not seen this before last Windows 1903 update.