Pally 2 set
Are you checking the buffs panel or the character sheet (or both)? Even if the buff doesn't appear, it's worth checking the character sheet to see if you're still getting the extra block chance.
I haven't seen any buff, but you can check the difference in your block % on the character tab. Honestly though, if you're only using WoG when necessary, you shouldn't really need to worry about when the 2-set is up or not. If all else fails, maybe try finding an addon that can let you know when it's up.
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