Happened twice on two separate PCs. Windows 10 won't update to the latest version. But..........when the next update comes out the PC automatically updates to the next one on. This morning this one went from 1903 to 20004 missing 1909. Whereas the other one wouldn't update from 1803 to 1809 but went to 1903 later.

First time I was worried but this time i just left Microsoft to get on with it.