Share your experience!
I have the exact same issue.
Surprised more people don't see this.
BTW, I've noticed it only seems to happen in built-in Messaging app. In other places voice dictation works fine.
But in Messaging, it looks as if it is translating what you say perfectly, but then suddenly everything disappears before you can click send....
Voice text disappearing happens on my Z5 and my wife's XA when using the Messaging app. Frustrating. I saw a recommendation to clear data/cache within the messaging app but have not personally tried it.
It is always random when it does this too. Not consistent so I don't think clearing the data/cache will help.
Bob H