New Foundation decks not playable due to missing cards
After new decks being collected from the Foundations release, a few of them appear to be missing cards from them. These decks are not playable until the cards are added to them.
Deck and missing cards:
"White and blue" deck: Temple of Enlightenment
"White and red" deck: Temple of Triumph
Cat Attack: Felidar Retreat
Learn from the Land: Temple of Mystery
Morbid Machinations: Temple of Malady, Midnight Reaper
Undead Resurgence: Death Baron
The "white and blue" and "white and red" decks did not have a name, but those were the colors associated with it.
I am not sure if the cards are not collecting because I have multiples of older versions (a bug) or if the missing cards were just not added into the collection after being sent out.

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Jey#37179 commented
It seems my friend who plays did get the full cards in their collection when collecting their decks. We went through those decks on their deck list, and all the cards from them were collected.
If it matters, they play through Steam and I play through the regular windows client.