(in good agreement with the MR-AQCC results) of the hand-selected active spaces in all transition states, despite not directly enforcing any consistency between active spaces beyond the size. For reference, we show the single-reference limit of MC-PDFT in which the CASSCF wave function densities are replaced with HF densities (equivalent to so-called "densitycorrected" PBE ); here we refer to this approach as HF-PBE. Unlike APC(6,6)-tPBE, HF-PBE dramatically overestimates the stability of the concerted transition state (CTS) while greatly underestimating the stability of the TS-Anti transition state and intermediate. Thus, our automated scheme successfully reproduces the important multiconfigurational results.