I have a library with defined variables - primitives and tokens. None of them is “hidden”, but when I import the library to a design file I see only a part of the primitives, but none of the tokens. It says they are hidden but they are not. Any idea? Thanks! 
Hey @Roland_Dombi, thank you for reaching out!
Hmm, I am not sure what could cause this, let me ask the team internally and get back to you asap.
Appreciate your patience in the meantime!
Can you please check if the variables are hidden from publishing?
Please check out our Help Center article for more information:
https://help.figma.com/hc/en-us/articles/360039238193-Hide-styles-components-and-variables-when-publishing#h_01HD20M7HS9044NHB2YBJNE9C2.
Please let me know if this is not your case, I’ll submit a support ticket on your behalf.
I had exactly the same problem. To solve this, simply rename your collection of primitives and tokens with a capital letter. (Tokens instead of tokens).
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Hey man, this is a life saver - it worked! Thank you