4th Sunday of Advent calculated incorrectly

[firefighterchuck]

I use this node to calculate the first Sunday in Advent for the purpose of Christmas lighting. I have the Holiday entity defined as the 4th Sunday of Advent -21 days. This has worked in the past, but this year the date returned is one week prior to the actual start of Advent. While investigating, I found that the node thinks the 4th Sunday in Advent is December 17 instead of December 24.

I have attached the output payload from the node, as well as screenshots of the Holiday Entities.

payload.txt