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Interesting! I guess I missed the additional rules on Treasure Map when I was trying to figure out what happened.

Searching around more it looks like this is explicitly called it in the rulebook:

https://dominioncg.fandom.com/wiki/Treasure_Map

Thanks for the reply :)

Now I'll go back to doing other stupid things that don't work like Prince-ing a Prince.

Reproduction on game with log "Joining game #68772477 on frankfurt"

TL;DR - I played a Throne Room with 3 Treasure Maps and only got 4 gold.
The rules say I should have 8.
https://boardgames.stackexchange.com/questions/1996/dominion-what-happens-when-i-play-throne-room-on-a-feast-since-feast-gets-trash



Setup:
Have Throne Room (Room) and 3 Treasure Maps (Map) in hand.
Use Room, select Map.

Expected:
One Map goes down next to the Room.
First Map goes off,
-> One Map from hand is trashed, 4 golds added to deck.
Second Map goes off,
-> One Map from hand is trashed, 4 golds added to deck.
Now I have 8 golds on top of my deck.

Actual:
One Map goes down next to the Room.
First Map goes off,
-> One Map from hand is trashed, 4 golds added to deck.
Second Map goes off,
-> One Map from hand is trashed
Now I have 4 golds on top of my deck.