Heya Akeera!
I guess you're talking about
FS#2511.
This report was set "private" after you opened it, so that no-one but testers, devs and you can see it anymore. This is done to avoid spreading exploits via the tracker.
Shortly after you reported the exploit it was fixed and will not be "available" anymore after the next update

It's allowed and highly encouraged to report every exploit you find while playing! We're just making sure that reported exploits don't get even more known
Greetings
EDIT: Also keep in mind that only open bugs are included in the tracker's search by default - This could explain why you weren't able to find it anymore.