Reform validation doesnt work in Rspec tests

I have written myself a model that looks something like this:

class PersonalDetailsForm < Reform::Form
  include Reform::Form::ActiveModel::ModelReflections
  include Reform::Form::Module

  model :user

  property :name
  validates :name, presence: true

  ProfilePrepopulator = lambda do |_options|
    self.profile ||= Profile.new()
  end

  ProfilePopulator = lambda do |model:, **|
    model || self.profile = Profile.new()
  end

  property :profile, populator: ProfilePopulator, prepopulator: ProfilePrepopulator do

    property :date_of_birth

    validates :date_of_birth, presence: true

    AddressPopulator = lambda do |model:, **|
      model || self.address = Address.new
    end

    AddressPrepopulator = lambda do |_options|
      self.address ||= Address.new
    end

    property :address, populator: AddressPopulator,
                       prepopulator: AddressPrepopulator do
      property :city

      validates :line1, presence: true
    end
  end
end

In controller I go

form.validate(params[:user]] && form.save

And it works very well when i just run the browser and click around, but it doesnt do very well in request specs. for the mentioned above action to take place i send request with params for user, profile but not for address. it should fail, but it passes, somehow rspec doesnt see this last nested validation. If i remove validated params for profile it fails. Any idea how to fix this?