https://stackoverflow.com/questions/64461565/why-unity-includes-the-editor-directories-in-build
1.Unity自动识别Editor文件夹，在building的时候进行忽略.
2.如果指定了asmdef,则子文件夹下的Editor文件需要再指定一个editor asmdef
As @Thomas says, yes, you have to check that your Editor files are stored in the Editor directory, and use the compiler directive when you use them.
BUT this problem seems more related with Assembly Definition files, check this related link.
Are you using assembly definition files? They don't respect Editor folders. You need to add Editor asmdefs.
Summarizing, if you have one .asmdef file in your project, and you are using Editor scripts, you need to ALSO have a .asmdef file for your Editor scripts.
标签：unity,文件夹,asmdef,editor,your,Editor From： https://www.cnblogs.com/sun-shadow/p/16904022.html