timestamp set to current_timestamp CANNOT BE UN-DONE
Database management in a single PHP file
                
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    Create a table with this
CREATE TABLE bug (
id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
currentTimeStampBug timestamp NULL ON UPDATE CURRENT_TIMESTAMP
);
And then, using the UI, try to REMOVE  the "ON UPDATE CURRENT_TIMESTAMP".
It will ALWAYS be set, regardless of what you click / try to do.
If the field is 'datetime' though, all seems working fine
I can not reproduce this problem with MariaDB 11.5.2 and latest Adminer.
It's the default behavior of this type.