I fall into the group that have had nearly zero problems like this.
I have one original Schon shaft with the ivory ferrule intact. The other original shaft has had the ferrule replaced twice in 22 years. The original ivory ferrule was hacked up by a guy I thought was a competent repairman/cuemaker,so it had to be replaced.
If I had gotten close enough to him,his head would have had to be replaced,

I had it's replacement crack on me because of an extreme draw shot in a tournament with no pad and a tip that had a sidewall about .050 thick,that one is on me.
The ivory ferrule on it now is still perfect.
I saw one one time where the owner left his cue case in his car while he was in a restaurant,etc,so the time in the cold was 2 hours MAX. It was about 20 degrees that night.
He screws it together,and when he hits his 2nd ball,the ivory ferrule on this South West exploded like a light tube,and left pieces all over the table small enough the only thing they could do was vacuum the cloth.
The picture showed is an extreme example. I know people that have ivory ferrules that have been cracked for 10 years or more and it never shows in playability. This one sure will.
That sucks,Tommy D.