There are scare stories that do the rounds, but if you are considering becoming a pilot you shouldn't let this get in your way, it's one in a million and likely involves certain people having fallen out over company politics etc.
What actually matters to keep your license is the LPC, not the OPC (though they are often the same exercises). The OPC concerns your employer and LPC concerns your license.
Worrying about failing an LPC (or OPC) shouldn't be a concern either, it's practically designed for you to pass and they don't change from year to year, it's very scripted (for better or for worse). The difficult bits in the sim are the recurrent training, where you cover all manner of failures that you'll often only see every 3 years (at least in my old operator).