In the legacy Cloud Application Studio, the system connections are stored in the Windows Registry, path
\HKEY_CURRENT_USER\SOFTWARE\SAP\SAPCloudApplicationsStudio\<release>\DialogPage\SAP.Copernicus.CopernicusOptionPage
Key: SystemConnections.
Upgrading the legacy Studio was tedious enough, having to manually copy that entry to the registry path of the new version.
In the new (pilot) release, they are stored in a different path and format.
The path is
\HKEY_CURRENT_USER\SOFTWARE\SAP\SAPCloudApplicationsStudio\<release>\ApplicationPrivateSettings\SAP\Copernicus\CopernicusOptionPage
The key is still SystemConnections.
And the connection XML is preceded by "1*System.String*".
So while the legacy value of the key SystemConnections started with
<ConnectionDataSet xmlns="http://sap.com/copernicus/ConnectionDataSet.xsd"><SystemData><Name>...
The pilot value of the key SystemConnections now starts with
1*System.String*<ConnectionDataSet xmlns="http://sap.com/copernicus/ConnectionDataSet.xsd"><SystemData><Name>...
Meaning, if you want to migrate your entries back and forth between pilot and legacy, you have to add or remove "1*System.String*" to/from the beginning of the SystemConnections.