No it’s not a common issue, nor is an oil leak onto the clutch, the dealer now has to send pictures or premature failures/oil leaks to warranty with vehicle ID in the picture, ask to be sent the pictures also, it is normal warranty procedure to warn a customer if Iike your dad there is a possibility when the box is removed and say the friction plate is worn to the rivets from resting your foot on the clutch or other customer led damage. Then no dealer/manufacturer would cover damage if customer induced. But ask to see the part for your self of if not local ask to be sent the e mailed pics. Hope it turns out to be an input shaft seal leaking and contaminated the clutch so it’s all covered for you!!!