Had tried just this

But it actually adds another instance of shapeshift theme (named: shapeshift 1) instead of updating the existing shapeshift.
Basically what I think is themebuilder is looking at new shapeshift as a different theme as we are techinaly not pulling it from the cloud. And instead of updating the old shapeshift, it's just adding it as new one. (Again, I'm talking about shapeshift theme inside thrive theme builder theme. The thrive theme builder theme is updating and working just fine
(Thrive should really change names lol)