Filtering posts by internal tag is not showing on Ghost Pro hosted pages

I am using Ghost 14.16.0. I have noticed that when I am trying to filter posts based on hash-tag, I don’t get any results in Ghost Pro. But this is very interesting that I am getting results when I am using self-hosted Ghost (like digitalocean), it is working perfectly fine

live-link url: Our Results

Unfortunately, my client locked his website since we are still developing the theme.

Does that happen to you? Is there any way solve it?