Potential evolutionary paths of TOI-6894 b. Upper two panels show results of the scenario with a flyby of a 150 au disk at a distance of 120 au (Figure 2(b)), and the lower two panels correspond to the scenario with a flyby of a 100 au disk at a distance of 90 au (Figure 2(b)). Left panels present contour maps of the final orbital radius of TOI-6894 b corresponding to the initial orbital radius and formation time of its protoplanet. The orange dashed contour marks the present-day semimajor axis of TOI-6894 b (0.026 au), and the red dashed contour indicates its estimated mass (0.168 M_J). Their intersection points (black star signs) indicate the most plausible initial condition of the protoplanet within the first-generation disk, whose growth and migration paths are depicted in the right-side panels, where the pink curves represent its evolution within the first-generation disk, followed by purple curves illustrating evolution within the second-generation disk. The red asterisk denotes the final state of TOI-6894 b. The time span between dots on the curves is 1 Myr. The gray and black dashed lines indicate the pebble isolation masses in the first- and second-generation disks, respectively.