This build is just fixing a few small things. Hopefully I'll have a beta by next week, and the final by Thanksgiving!
To get this update, make sure you have "Also check for pre-release (beta) versions" enabled in Settings, and then click on the Check Now button. (Unfortunately alpha/beta releases are not currently available for the Microsoft Store version of the app.
You can also download directly: https://github.com/paintdotnet/release/releases/download/4.206.7254.40989/paint