Issue in a prepare statement that is "too long"

I have a problem with QODBC driver. I am connecting to a MSQLserver 2017. I have the following Native Client: ODBC Driver 17 for SQL Server

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QString str1 = "SELECT * FROM Table1 WHERE FullName = :FullName";

QString str2 = "\\\\abcidnas\\data\\Formats\\avexxxrokee_xxxxbset\\Cvvvvv_JJJJJJJJJJ\\RS2_OK7002_PK95155_DK94211_SCNB_20090909_234152_HHHHHHHHH
LLLLLLLLLLL.tif";

if (Query.prepare(str1))

Query.bindValue(":FullName", str2);

Query.exec();

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we have observed that if the value for the bindvalue for the prepare statement is too long, then the prepare statement fails with 

QODBCResult::exec: Unable to execute statement: "[Microsoft][ODBC Driver 17 for SQL Server][SQL Server]The data types nvarchar(max) and ntext are incompatible in the equal to operator. [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]Statement(s) could not be prepared."

We don t use at all NTEXT in the design of our database.

what works:

if I use a Direct Exec and not a prepare statement it works.

Query.exec("SELECT * FROM Table1 WHERE FullName = '\\\\abcidnas\\data\\Formats\\avexxxrokee_xxxxbset\\Cvvvvv_JJJJJJJJJJ\\RS2_OK7002_PK95155_DK94211_SCNB_20090909_234152_HHHHHHHHH
LLLLLLLLLLL.tif'"))

If the binding value is small then it works.

Other things tested

I tried several datatype for the column FullName : NVARCHAR(MAX), VARCHAR(MAX),... nothing worked.

Maybe I am missing a configuration .... 

Thank you, any help appreciated. This is customer issue.