Hi Remy,
Thank you for contacting Syncfusion support.
Query # 1: Unlocked cells become locked in copy/cut paste action in spreadsheet.
We have checked your reported issue in our end and we considered this as an improvement. And the fix will be available our Essential studio volume 1 SP 1 2021 release. We appreciate your patience until then. You can track the status of this feature using below link from our feedback portal. We appreciate your patience until then.
Query #2: Paste values only not working programmatically.
We have checked the reported issues and the paste option works only properly in our end. And CTRL + V action paste only the values instead of paste the formats in spreadsheet. In your sample also border not applied in the pasted cells. So, please ensure that you are using the latest version in your application.
Could you please check the above details and get back to us, if you need any further assistance on this.
Regards,
Sangeetha M