Oxygen 4.0.4 is a minor release that includes approximately 16 tweaks & bug fixes.
Existing users can download Oxygen 4.0.4 beta 1 in the customer portal.
Please note that alpha and beta releases of Oxygen and the associated add-ons should not be used on production sites. We do not provide official support for alpha or beta versions of Oxygen or the associated add-ons. If you encounter bugs, please report them on GitHub.
Below is a mostly complete changelog of the changes included in Oxygen 4.0.4 beta 1.