When i union these part they shrink and they delete some of the part
https://gyazo.com/8e33cdee567d7e65e9e1166d4ec6aa61
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This can happen if a part is too big. There is a max size for everything in studio (2048x2048), and when you try to unite 2 maxed-out parts, it will either refuse to join or resize to the maximum scale that it is coded to cap at.
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