This release will be available starting April 16, 2020 and affects several themes.
IMPORTANT: This release is only available for Office 365 Classic experience, as well as, Office 365 and SharePoint 2019 Modern experience.
Fixes
Office 365 (Classic)
The "Connect to Office 365 Group" option now functions correctly in classic team sites.
Office 365 and SharePoint 2019 (Modern)
An issue where an extra, unintended navigation would appear after scrolling in certain environments has been fixed, ensuring a clean and consistent navigation display.
The "Search Center URL" property on the panel has been repositioned for better usability.