WhatsApp Default Chat Theme Missing on iPhone

I have an iPhone 11, and despite having the latest version of WhatsApp and up-to-date settings, I am still facing an issue where the default chat theme doesn't appear, and instead, the wallpaper option is displayed. Everything on my phone is up to date, and I should have received the default theme, but it hasn't shown up yet. It's not just me – many other users, including those with iPhone 7, are facing the same problem. However, some iPhone models like 11, 12, 15, and 16 still don't have the theme feature. I expect this issue to be addressed promptly and fixed as soon as possible. It's frustrating when such a basic feature is not working.