VS Solution contains strange projects

Questions & Answers
1

I updated from Unity 2017.2 to Unity 2018.2 and since then my VS solution is weird. Previously it had only one project with my source code. Now it has 4 projects and none of them contains my source code. It looks like this:
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Is there any way to fix it?

2

This helped
https://stackoverflow.com/questions/48981641/is-there-a-way-to-prevent-this-weird-project-and-solution-generation-done-by-uni