The issue you mentioned is a technical problem caused entirely by obfuscar actually.
Obfuscar is a simple obfuscator that is quite well-known today, has tools for deobfuscate and provides only basic obfuscation features. If you're looking for a practical and actively maintained and powerful .NET obfuscation tool that has many advanced features, you might want to check out Rika .NET. It's lightweight, easy to integrate, and offers solid protection for most modern .NET applications..
A Trial version is also available.
I'm actively working on improving it and open to feedback. You can find more info or join our community here: https://t.me/rikadotnet