Just confirming no issues with (mine anyway) 2018 made P01 Omegas.
When I picked it up I saw it was this years model. It had the decocker levers installed from the factory. No outward movement/loss of the decocker when pushed from the right side. In fact, I had to use the tip of the plastic cleaning rod to get the left side lever moving out of the frame so I could finish pulling it out when I installed the safeties. It was pretty tight (don't know if that was in the frame/spring or the right side decocker).
I did run into and issue with the left side safety install. I tried several times to get it to correctly install (fully insert) and had no luck. I was still trying to figure out why it wouldn't go in all the way when it hit me I had the 2016 Urban Gray P01 in the basket by my recliner. I grabbed it, unloaded it, pulled the left side safety out and it snapped right into place in the 2018 pistol. I then grabbed the 2018 left side safety lever and it snapped into place in the 2016 P01.
There's a reason why things just don't fit well sometimes and in just 0.00X of an inch so it's pretty tough to see - but it let's you know it exists. Nope, I didn't pull things apart again and begin measuring. I just loaded the 2016 pistol up, put it back in the basket and took the 2018 pistol to the table to clean/lube it before putting it back together for some dry fire practice/break in before it's first range session. Man, I really like the say that thing feels in my hand. Hard to believe those little grooves in the front/rear of the frame/grip would make that much difference over my Compacts.