Notice the issue here. When the user clicks the “Add” square in the top icon nav it imports a model, but it isn’t recoginzed at a model until you click on it again and then hit Add Part, Load and then browse for the file then TWO files become imported. This wasn’t the previous behavior!!
This update breaks a bunch of norms.
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Just a friendly reminder, since you are now opening several topics with the statement: “This wasn’t the previous behavior!!”
The button at the top of the navigation bar has a different function than “Load object”. These are two different path options! Incidentally, the same issue arose in your other topic. Take some time to familiarize yourself with the program.
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The Add button in the navigation bar at the top adds the part as an extra object:
The “Load object” option, on the other hand, inserts it as a group into an existing object.
If you look closely at your pictures, you can even see the difference: one is a group, the other is individual objects. In addition, there is the question of how you saved the project or object you are inserting beforehand: as one object or as several objects.
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This is not a Bambu Studio problem, but when I look at the previous topic you opened at the same time: ‘What are groups, and what do the different buttons do?’ I hope I was able to help! Take another look at everything in your own time and experiment with the difference between ‘Add’ and ‘Load Object’. 
