Lengthy WhatsApp text messages doesn't appear completely

I am not sure if other iPhone users are facing this issue but I have observed it quite a few times. A lengthy text message just ends abruptly. If you copy it and paste in notes or an app like Google Keep it appears there completely, with the missing part that I didn't see in WhatsApp.

I am posting it here since I have observed this issue only on iPhone/iOS and not on my previous Android phone.