Hi there, jhyang
I logged in simply to express my deepest gratitude for your solution above. I spent several days trying to understand why Unraid 6.12.13 couldn't recognize the I219-V in my ASUS Z170i Pro Gaming motherboard, but thanks to your post, I was able to resolve the issue. I have gone ahead and implemented the solution to other I219-V (e.g. ASRock H270M-ITX/AC as the other poster), and will share this information whenever I come across anyone dealing with this problem.
Have a great one!