[MacOS] Can't paste very long clipboard text

We are using QClipboard to copy a csv text format, but when the text is long, there was nothing pasted.

We have a table with 400 columns, the csv text format of each row is 6600 characters.

If clipboard text is about 20k rows, the clipboard text can be pasted in other applications, such as Exel, Number. But if the number of rows is greater 20k rows, there is nothing is pasted.

Do you have any idea about this?

Memory information:
Physical Memor: 8GB
Memory Used: 4GB
Cached Files: 982 MB
Swap Used: 546 MB

Thank you