The Mormon version of "Holy, Holy, Holy" is missing something

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I've always loved the song, Holy, Holy, Holy. It's a beautiful hymn, and I find myself humming it a lot. Of course it always sounds better when someone else does it, and when an entire choir sings this in four-part harmony, I get goosebumps. But recently someone passed this version performed by the Mormon Tabernacle Choir, and pointed out that something crucial is missing. Can you find it?

(Hint: the first instance happens right around the 1:05 mark.)

 

In case you are short on time or the video doesn't play, I will provide the lyrics here:

Holy, holy, holy! Lord God Almighty! Early in the morning our song shall rise to thee. Holy, holy, holy! Merciful and mighty, God in three persons, blessed Trinity!

Holy, holy, holy! All the saints adore thee, casting down their golden crowns around the glassy sea; cherubim and seraphim falling down before thee, which wert, and art, and evermore shalt be.

Holy, holy, holy! Though the darkness hide thee, though the eye of sinful man thy glory may not see, only thou art holy; there is none beside thee, perfect in power, in love and purity.

Holy, holy, holy! Lord God Almighty! All thy works shall praise thy name, in earth and sky and sea. Holy, holy, holy! Merciful and mighty, God in three persons, blessed Trinity.