Two fieldsets for the same relationship on two wizard steps not working

I have a wizard that saves some data on User, and some data on Profile which belongs to a user.

The fields that are related to Profile are put on two different steps of a Wizard inside a Fieldset with relationship method pointing to the HasOne profile relationship on user model.

It works fine if I only have one fieldset linked to this relationship, but breaks when I have two.

Any ideas how I can fix this collision?
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