>>96223704
>>96223861
https://youtu.be/-nu-JmZ4joo?t=84
If it was meant to allow a second light property attack, that would have been stated here.

https://www.dndbeyond.com/posts/1742-your-guide-to-weapon-mastery-in-the-2024-players
Their article also clearly states you don't get more than one extra attack from the light property.
>Keep in mind that this doesn’t mean you can make a third attack as a Bonus Action, as the Light property specifies you only get one extra attack. But, while it may not pump your damage, this frees up your Bonus Action to use class/species abilities, such as the Rogue’s Cunning Action, while still getting an additional attack in.

AND when the article made a mistake, it was corrected.
>This article was updated on August 12, 2024, to issue corrections or expand coverage for the following features:

-What is Weapon Mastery?: Made clear that the Rogue is proficient with all Simple weapons.
-Slow: Clarified that the Slow property doesn't stack with itself.

But no correction was made for Nick.