OLEDB Data Source Limit Lenght Of String To 4000

Hello,
I have 2 table, "table1" is the source one and the other one "table2" is the destination.
Columns in Table1 and in Table2 are nvarchar(max).
Data loaded from table1 is performed by SSIS OLEDB data flow source, I have found out that opening "Data flow Path Editor" in the Metadata, columns are as: DT_WSTR with lenght 4000.

First question:
Why SSIS limit the column to 4000.

Then I get some error for this issue, with the error:
input column "col1" (xxxx) and reference column named (coln) have incompatible data type.

As written before both columns are string, the problem is that SSIS limit the lenght of the string to 4000.

How can I solve this issue?

Thank