Well, see popularity of CGO among Go devs, or JNI among Java devs, or the ongoing work to make all the learnings from System C# (from Midori) available in regular C#, while C++/CLI is slowly left in maintenance mode (last updated for partial C++20 support, and not part of FOSS .NET)
All of those are for non native code to call code in those languages. Nobody is saying "all Go code must never invoke native code". That would be wild and to my knowledge, there's no major language that forces such a constraint.