Hi crosslife,
Based on the information provided, we understand that you have encountered an issue where text containing a comma is not pasted correctly in the Spreadsheet. Upon investigation, we found that when content is copied from an external source, SfSpreadsheet does not support paste formatting options (such as format settings). This limitation is outlined in the user guide documentation. You can refer to the link below for more details:
If you require the formatting to be applied, we recommend using the "Format Cells" option in the ribbon to set the desired formatting before pasting the text. Additionally, instead of pasting the content from Excel, loading the Excel file directly into the spreadsheet will ensure that the formats are applied correctly. Thank you for your understanding.