def2-TZVP beyond Rb (example: iodine atom)

Dear QChem community,

I am having problems using the def2-TZVP basis set with iodine atom. Following the manual, beyond Rb atom the keyword “ECP def2-ecp” must be used (page 762 example 8.7 shows how to use it (8.12 Built-In ECPs‣ Chapter 8 Basis Sets and Effective Core Potentials ‣ Q-Chem 5.3 User’s Manual). However, when I use it in a simple HF calculation:

0 1
H 0.0 0.0 0.0
I 0.0 0.0 1.5

ECP def2-ecp

I obtain that the number of electrons is incorrect (it should be 27 alpha 27 beta electrons):
Molecular Point Group Cv NOp =**
Largest Abelian Subgroup C2v NOp = 1
Nuclear Repulsion Energy = 8.81962018 hartrees
There are 13 alpha and 13 beta electrons
Requested basis set is def2-TZVP
There are 20 shells and 56 basis functions

Do you know what is happening here? Thank you very much in advance for your help.

The original Ahlrichs def2-ECP paper,

describes ECP-28 for iodine. So 28e removed + 26e explicit = 54e, so this looks right for HI molecule.