To continually develop and improve the plugin, in the latest release, we changed the default notification behavior to a Box layout with fixed dismiss duration. This allows the Store Closed status notification to be more dominant for visiting customers, informing them of the status.
In addition, to better optimize the notification with cache based plugins and services, we changed to AJAX instead of HTML source.
As you can see, we tried to reproduce the behavior you outlined, version 4.1.2 updating to version 4.2.22 and the new notification box is loading.
If you made customizations to the HTML from version 4.1.2, you can revert back, by downloading the previous version from here: https://www.ads-software.com/plugins/order-hours-scheduler-for-woocommerce/advanced/ or customize using the new AJAX based code.