What situational irony occurs in “the colomber” by dino buzzati¿

The Situational Irony that occurred in "The Colomber" by Dino Buzzati was the fact that Stefano gave up his dream of becoming a sea captain to ensure that he will live a long life after seeing the Colomber.

It was believed that the Colomber was a harbinger of Death and that whoever sees it will be doomed for life.

However, the reason why the Colomber was after Stefano was because it was tasked to give Stefano a pearl that will give him good luck and success in life. 

It is ironic because the reason Stefano feared the Colomber was false and baseless.