Public Variables Stored in Prefab are Lost When Moved to Another Project

Unity Engine
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1

I hope I can describe this clear enough:face_with_spiral_eyes:

So I have these public variables in my script

In my prefab, I added an empty object and set up the script like so

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After I copy my asset folder (including these script, prefab and meta files) to another project, I can still see these settings in prefab, but it disappear when I drag n drop it in the scene:

Is this normal?

2

After some recopying for a couple of time, the problem is fixed.
Still, I have no idea why the setting of the script will be changed after dragging prefab into the scene