I've noticed this too for carps for example, but for smaller species too, like breams/ides/whitefishes.
I don't know if it's a real issue or not. In real life, you will miss tons of bites for unknown reasons (small and big fishes).
Maybe the "fish got away" message doesn't appear, because the fish simply did not hook itself, just having the bait in the mouth and pulling on the line.