The 1.1.1 RC 1 of Oxygen's Gutenberg integration contains a handful of compatibility fixes for WordPress 5.3 and the latest version of the Gutenberg block editor.
Existing customers can login to the customer portal to download the release candidate.
Oxygen-Gutenberg 1.1.1 RC 1 has been tested thoroughly and is considered stable enough for use in production environments. We will provide official support for sites running Oxygen-Gutenberg 1.1.1 RC 1. You should always perform a full backup of your site before upgrading to an alpha, beta, or RC version of Oxygen or associated add-ons.
If you encounter any issues with Oxygen-Gutenberg 1.1.1 RC 1, please report them on GitHub.
Below is a mostly complete changelog of the fixes included in Oxygen-Gutenberg 1.1.1 RC 1.