Trace something and select a function with some params. Hover any param. Seems like the descriptor doesn't supply enough information for the params to be displayed properly in the view. Hence they're all translucent with a red underline. Twisties don't appear either.

Twisties not appearing is on purpose. There isn't enough data to cause pagification or mental data overload so we just expand everything and hide twisties so that there is less visual noise. We don't get any enumberable/writable/etc data from the tracer for performance reasons.

We should not allow styling the variables based on descriptors. There's the preventDescriptorModifiers property on the variables view, but I can't be sure if that's enough in this particular case.