Hi Michael,
Thank you for contacting Syncfusion support.
We have analyzed the reported behavior “The Segment Editor doesn’t save into the database” and it works fine from our end from the shared sample, we have tested the sample and it works fine the values have properly set the data property and it updates the DataSource and it works fine on runtime while changing the value too.
Tested Version: 16.4.0.54
If the issue remains same, kindly share us more details like the version you have been using and device details and replication procedure, which help us to analyze and resolve the reported issue.
Regards,
Deivaselvan