Upgraded to 4.2.0.21. I got that same message about the “feature-xt9” package (also got the LONG list in the previous upgrade).
Out of interest I tested and noticed that while the Dropbox-signin still doesn’t work in the built-in Browser, I was able to complete it in Firefox.
Also I noticed that while adding an Exchange account still does not ask for the MFA, the account is added without errors. The built-in email app claims that it was able to sync Ok, and even shows my email folders, however the folders are all empty.
Are these purely coincidental, or have these issues been worked on?