Yes, I heard and saw and it's been proven that Slicing got nerfed by 80%.

Decided to buy one of those 450 credits Mission Discoveries out of curiosity and of course discovered that it wasn't permanent.

Not sure what's the point of buying a misleading 'Wealthy' and 'Prosperous' yield Mission Discovery, only to discover that I needed to

1) Pay a 2nd larger sum of credits to do the mission

2) Mission takes longer time

3) Mission has a higher failure rate

4) Mission will crit(blues/purples) if successful but only yield 75% lesser quantity of what you get in rich missions.