Joy To The World Lyrics Have Changed! - Mandela Effect

How many of you remember singing this in Catholic Mass the night before Christmas?

"Joy to the World, the Lord has come..."

Welp. It's now "Joy to the World, the Lord IS come..."

Sounds very similar but how incorrect is that English?! The Lord IS come?!??!! What does that even mean?

What do you remember? Is this a Mandela Effect or just a mass-mishearing of the words?