Numbering order in IUPAC name of a trisubstituted alkatriene

During E/Z-nomenclature class, I found this molecule.


[![bond-line representation of molecule under this question](https://i.stack.imgur.com/uIAlh.png)](https://i.stack.imgur.com/uIAlh.png)


Using [*MarvinSketch*](https://chemaxon.com/products/marvin) 21.15.0 version I have **(3*E*,5*E*)-6-bromo-3,4-dimethylhexa-1,3,5-triene** for it. Why the name couldn't be **(1*E*,3*E*)-1-bromo-3,4-dimethylhexa-1,3,5-triene**? What I missing?


