Non-resonant HR 8799 system dissolving after approximately 0.65 Myr in isolation. When perturbed by neighbouring cluster stars, this system nonetheless reached the cutoff time of 10 Myr. The shaded areas indicate the range between each planet’s pericentre and apocentre. Around 1.4 Myr, the system alters its architecture by swapping planets, expanding the orbits of HR 8799 e and HR 8799 c, and shrinking the orbit of HR 8799 d. HR 8799 e and HR 8799 c do not interact despite overlapping areas, as their orbital orientations differ.