Just updated my blog to WordPress v5.9.1 which was a maintenance and bug fix release. As always, I backed up my files and database first. I have automatic updates disabled so I can do this beforehand. As I usually do, I updated the local copy on my PC before updating the blog here.
No themes were updated to I didn’t have to do anything to my TwentyTwelve child theme. So far the upgrade seems to have gone well. 🙂 They even improved the selected text color selection so it’s not so much hidden behind the right-side bar. I made this post about it: [Advanced Editor Tools (previously TinyMCE Advanced)] Text Color Custom Popup below Side Bar.