Commented by: @AlexPeshkoff

Did not reproduce, at least in B2_5_Release:

SQL> CREATE DATABASE 'test_utf8.fdb'
CON> PAGE_SIZE 4096
CON> DEFAULT CHARACTER SET UTF8;
SQL> CREATE TABLE TEST_A(
CON> ID VARCHAR(32) NOT NULL,
CON> DATA1 VARCHAR(5000),
CON> DATA2 VARCHAR(5000),
CON> DATA3 VARCHAR(5000),
CON> DATA4 VARCHAR(5000),
CON> DATA6 VARCHAR(5000),
CON> DATA10 VARCHAR(5000),
CON> PRIMARY KEY (ID)
CON> );
Statement failed, SQLSTATE = 54000
unsuccessful metadata update
-new record size of 120146 bytes is too big
-TABLE TEST_A
SQL> CREATE TABLE TEST_A(
CON> ID VARCHAR(32) NOT NULL,
CON> PRIMARY KEY (ID)
CON> );
SQL>

Commented by: @dyemanov

I suspect the error happens in the SET AUTODDL OFF mode.