Do I have the wrong dipstick?

New (to me) 2017 Prius Prime owner.

I have put about 6,000 miles on the car, and during this time the dipstick never changed in level, whether hot or cold. It’s up to the dot where Toyota marks the “normal” Full level of the crankcase, so I thought that’s perfect.

Recently I had some cold start rattling that was louder than what I felt comfortable with, so I checked the dipstick and it was still Full. Put a half quart of 0W-20 and checked after wiping off with a rag, no change. Put the rest of the quart in, still no change. The dipstick reads Full.

Now you must be thinking, car isn’t level, hot or cold, nope. Car sits in a level garage (a stick shift wouldn’t even roll when out of gear and no parking brake) and I have checked it in 32F and 85F weather.

But now my rattle noise is gone. So was I a quart low? Is there a chance someone put the wrong dipstick in my car, and if so, shouldn’t it be way over full if it truly was the wrong one? Or am I actually a quart over, and about to blow the seals on the engine?

First used car of many that has decided to throw me for a loop on the oil level!