Minor Bug? DDL generated when making an existing column virtual

Hi, I think this is a bug in versions up to and including:

Version 18.3.0.277

Build 277.2354

The DDL generated when altering a column to become virtual is incorrect. e.g.

Simple table

CREATE TABLE "TEST_TABLE" 
   (    "COLUMN1" NUMBER, 
    "COLUMN2" NUMBER
   ) ;

• Edit table in SQL Developer
• Select column 2
• click Data Type in edit dialog to expand column details
• change to Virtual with expression e.g.  COLUMN1 * 100
• Click DDL in tree view

SQL Developer has generated the following DDL:

ALTER TABLE TEST_TABLE DROP COLUMN COLUMN2;
ALTER TABLE TEST_TABLE MODIFY ( COLUMN2 AS ( column1 * 100 ) VIRTUAL );
ALTER TABLE TEST_TABLE ADD (COLUMN2 AS ( column1 * 100 ) VIRTUAL );

Clicking OK fails at statement 2 of course. Clearing the error dialog and clicking OK again then works. So I guess the modify shouldn't be there.

Cheers.