Wierd IntelliSense thing

foo.cs

public class Foo
{
  public OtherClass GetThing(params object[] stuff) => new OtherClass(stuff);
  public void DoThing()
  {
    var first = GetThing(..);
    
    // This was reported as having type `dynamic`
    var second = GetThing(..);
  }
}

public class OtherClass
{
    object[] _stuff;
    public OtherClass(object[] stuff)
    {
      _stuff = stuff;
    }
}