Nintex BOT truncated long variable string when insert to SQL Server

Hi,

I've tried to insert a variable data which get from image(png) to base64 with Python conversion. The variable contains the full and correct base64 string but when use Execute SQL Server library and tried to insert the variable into the SQL Server field with NVARCHAR(Max), it has been truncated and insert successfully but with a truncated string.

Do you have any suggestions for this issue ?

Version Use :
RPA Central 2.0.3
Nintex BOT : 17.0.3

Thank you.