MTG Studio is still using the "unofficial" 2-3 letter abbreviations. The reason behind that is that many users for years had created decks using those before WotC started streamlining.
MTG Studio used abbreviations are documented at
https://mtgstudio.com/wiki/index.php?ti ... d_EditionsDo you have a reliable source for "official" abbreviations of:
* Summer Magic
* Renaissance
* Anthologies
* Astral
* Multiverse
* Digital Cards
* Box Topper
* Introductory
* Foreign Language
* Collector's Edition
* Collector's Edition - International
* Commander's Arsenal
* Amonkhet
* Face the Hydra
* Rivals of Ixalan
* Dominaria
* Ugin's Fate
* Welcome Deck 2016
* Archenemy: Nicol Bolas
* Kaladesh Inventions
* Welcome Deck 2017
* Amonkhet Invocations
* Explorers of Ixalan
* Battlebond
* Global Series: Jiang Yanggu and Mu Yanling
* Signature Spellbook: Jace
* Guilds of Ravnica Mythic Edition
* Game Night
* Guilds of Ravnica Guild Kits
* Signature Spellbook: Gideon