Hmm. Can you please try creating a link.xml file with the following contents and let me know if that solves the problem?
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<linker>
<assembly fullname="Assembly-CSharp">
<type fullname="NodeCanvas*"preserve="all"/>
<type fullname="ParadoxNotion*"preserve="all"/>
</assembly>
</linker>
You can place the this link.xml file in any folder you want in your project (or even the root Assets folder).
Having said that, and because IL2CPP is an AOT compilation, you may still encounter issues, which should be solved by Generating AOTClasses.cs and link.xml file through the Preferred Types Editor [DOCUMENTATION LINK].
