texttv | SVT Text-TV in the terminal | Command Line Interface library

I see two main problems:

1. The notifyDataSetChanged method will force you adapter to re-render the whole set of items you have on your activity. It doesn't matter that your list differs from the new one in just one element: it'll get re-rendered in its totality.
   I'd recommend to use ListAdapter, which will handle you set for you with the submitList method. It is optimized for the use cases where you'll be updating your list very often.

2. And most importantly, the way your adapter is built. You have the property:

lateinit var binding: HolderTestBinding

Which is being set in every onCreateViewHolder call. However, it is a class field, and every time it is set, the reference of the older holder will be lost and, in every TestHolder instance, you'll be referencing the last inflated binding, hence, all of your view holders will be referencing the exact same view holder, instead of their own.
A better way of doing this is passing the binding to the constructor of every holder:

According to your layout, I've just updated your layout added colour to see the view, below is the layout and image.

Here is your layout: