Why don't multiple constraints in rails routing work?

Question

Ruby on Rails

Hello.
Here is routes.rb:

Rails.application.routes.draw do
  constraints Constraints::AppRouter.new('first_domain') do
   ...
    get '/' => 'users#search', constraints: -> (request) { request.params[:q].present? }
   ...
  end

  constraints Constraints::AppRouter.new('second_domain') do
    get '' => 'tech#default_action'
  end

If the request contains the "q" parameter, then control is transferred to users#search regardless of the domain. Constraints::AppRouter#matches? in this case is not even called.
Do I understand correctly that the general constraints, which are decorated with blocks, are eventually applied to each route. Then those constraints that were written in the routes themselves are applied.
Then I can explain this behavior.
That is, in order to do what I need, it is necessary to take into account the one at the top in each "inline" constraint?
Thanks in advance.