The main result of this work is a proof-of-concept demonstration that warped topography around a CX, resulting from an incorrect description of the topology of intersections involving S 0 when LR-TDDFT is used, can manifest in photodynamics simulations if those simulations are carried all the way through to the final S 1 → S 0 deactivation event. Unless this problem is rectified, using SF-based versions of TDDFT or other methods, nonadiabatic simulations with LR-TDDFT should be halted prior to the point where trajectories return to the ground state. Information gained from the part of the trajectory that approaches the incorrectly-described CX is likely unreliable.