Suppose we have three frames of reference, A and B, and a lab frame. Taking the lab proper time as the coordinate time, we can draw worldlines for A and B. B is stationary in the lab frame, so its worldline is a straight line at $x = x_B$. A initially moves at a constant speed $u$ until time $t=t_A$, at which point it instantaneously halts. We can let its worldline start at $t = 0$ and $x = x_0$, and the point where A halts be at $t = t_A$ and $x=x_A$ such that $x_0 < x_A < x_B$.
An observer traveling along the worldline of A will measure simultaneity with events along worldline B by seeing if the are parallel to his x-axis. But there is something that happens when A abruptly halts. The x-axis shifts from being positive sloping to being horizontal, shifting which events an observer in A sees happened simultaneously to ones that occurred further back on B's worldline, which observer A had already seen.
Would observer A see a younger version of frame B again?