Can't create NDB table in MySQL v8.0.28

Question

I am creating a table using the following statement:

CREATE TABLE interfaces (
    type VARCHAR(128),
    name VARCHAR(1024), 
    description VARCHAR(4096), 
    ikey VARCHAR(1024), 
    filename VARCHAR(4096), 
    syntax VARCHAR(4096), 
    hostname VARCHAR(256));

I get the error:

ERROR 1005 (HY000): Can't create table 'interfaces' (use SHOW WARNINGS for more info).

When I type SHOW WARNINGS; I'm presented with:

+---------+------+--------------------------------------------------------------------+
| Level   | Code | Message                                                            |
+---------+------+--------------------------------------------------------------------+
| Warning | 1296 | Got error 738 'Record too big' from NDB                            |
| Error   | 1005 | Can't create table 'interfaces' (use SHOW WARNINGS for more info). |
+---------+------+--------------------------------------------------------------------+
2 rows in set (0.00 sec)

From what I've read on the white papers for MySQL v8.0 here, is that:

Row size. In NDB 8.0, the maximum permitted size of any one row is 30000 bytes (increased from 14000 bytes in previous releases).

Don't I just simply add up the byte count in parenthesis of each column to see what my row size? ( 128 + 1024 + 4096 + 1024 + 4096 + 4096 + 256 = 14720 ) Am I missing overhead? And if so, is there REALLY an additional 15280 of overhead?