The skill card “ZEXAL - Zexal Weapon” doesn’t work

The original text doesn’t contain “at the beginning”.
So I think it is just wrong English translation in Duel Links.
The original text : https://youtu.be/_DaJrtSlQHw?t=35

It means you can active it anytime as long as you are on your main phase.
Like the video : https://youtu.be/irObuU09Q4U?t=693 (11:35~11:45)

In Omega, if you don’t active the skill “at the beginning of your main phase”, then you can not active it this turn.

replay:

Summary

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

Like the replay :
I can active it “at the beginning of my main phase”.
However, if I set a card (or do any action) , then I can not active it this turn.