Changing a colum to a virtual column does nothing

[M393]

Describe the bug

When only the virtuality of a column is changed in phpMyAdmin it does not generate an alter-table statement.

To Reproduce

Steps to reproduce the behavior:

1. Create a table like this

CREATE TABLE `area` (
  `id` int(10) NOT NULL AUTO_INCREMENT,
  `geometry` polygon NOT NULL,
  `geometry_buffered` polygon,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB

2. Go to structure
3. Change the structure for column geometry_buffered to Virtuality - stored with expression st_geometryfromwkb(st_aswkb(st_buffer(Area,0.0045)),4326)
4. Preview sql
5. It is is empty

Expected behavior

A statement like this should be generated:

ALTER TABLE `area` 
CHANGE `geometry_buffered` `geometry_buffered` POLYGON AS (ST_GeomFromWKB(ST_AsWKB(ST_Buffer(area, 0.0045)), 4326)) STORED;

Server configuration

• Operating system: linux
• Web server: apache 2.4
• Database version: MariaDB 10.11.7
• PHP version: 8.1
• phpMyAdmin version: QA_5_2

Client configuration

• Browser: chrome
• Operating system: win 10