With the following procedure you can reproduce the bug:

1. Query cache needs to be ON
2. Create the Table

CREATE TABLE `test`.`virtualtest` (
`id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
`aDateTime` DATETIME,
`isGreater` TINYINT(1) GENERATED ALWAYS AS (IF(CURRENT_TIMESTAMP()>`aDateTime`,TRUE,FALSE)) VIRTUAL,
PRIMARY KEY (`id`)
);

3. Insert data

INSERT INTO `virtualtest` (`aDateTime`) VALUES (TIMESTAMPADD(SECOND,30,CURRENT_TIMESTAMP()));

4. Select the data

SELECT * FROM `virtualtest` a;

Expected behaviour:
When current timestamp ist graeater than the timestamp in the table the field isGreater whould become true.
But when the query is executed before (isGreater=false) this time the result will keep FALSE even when current timestamp is greater.

Conclusion:
Obviously the result set is stored in query cache. I guess the check for query cache doesn't check the expressen of virtual columns.