1809 finally showed up as a normal update for me 2nd Tuesday in Jan 2019. Fortunately, the saving problem seems to be fixed but the File Association for DOCX files was changed to WordPad instead of MS Word (2016 in my case).
Noticed this as a Word shortcut on my desktop looked wrong. Trying to open it failed as the Word file is encrypted and WordPad could not deal with it.
Had to manually reset the file association for .docx files. Did not see any other wrong associations. Yet...