entityframeworkcore cannot insert a value (more than 255 characters) into Mysql database table with varchar(2000) column

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I create a table (table name is blog) with columns (blogid int, blogdescription varchar(2000)) in MySQL database, then I use EntityFramework.MySql to insert a record(with more than 255 characters) to this table, but it only can save the 255 charaters into
this table. It is very  strange. Do you have meet this problem?