rails 5.2.3 got "no route error" on /.well-known

[JackiMode]

Please use markdown formatting for code, configuration or console output.

1. Expected behavior

2.6.1 :001 > r = Rails.application.routes
 => #<ActionDispatch::Routing::RouteSet:0x00005649b37e8a58>
2.6.1 :002 > r.recognize_path "/.well-known/acme-challenge/lyQnV4QydflZ6px3YqoaFQupRAOeew69SSMv27nBRkc"
 => {:controller=>"acme_plugin/application", :action=>"index", :challenge=>"lyQnV4QydflZ6px3YqoaFQupRAOeew69SSMv27nBRkc"}

2. Actual behavior

Loading production environment (Rails 5.2.3)
2.6.1 :001 > r = Rails.application.routes
 => #<ActionDispatch::Routing::RouteSet:0x00005637a8726a38>
2.6.1 :002 > r.recognize_path "/.well-known/acme-challenge/lyQnV4QydflZ6px3YqoaFQupRAOeew69SSMv27nBRkc"
Traceback (most recent call last):
        1: from (irb):2
ActionController::RoutingError (No route matches "/.well-known/acme-challenge/lyQnV4QydflZ6px3YqoaFQupRAOeew69SSMv27nBRkc")

3. Steps to reproduce issue

install gem rails 5.2.3

4. Your configuration (ruby, rails version, your Gemifile and Gemfile.lock files etc.)

rails 5.2.3, ruby 2.6.1

downgrading to rails 5.2.0 solves problem

[rounders]

Am also seeing this on rails 5.2.3

[rounders]

A workaround is to add the following route directly to your rails project:

get '.well-known/acme-challenge/:challenge' => 'acme_plugin/application#index'

For some reason any route that start with a period doesn't get picked up correctly when defined in a rails engine at the moment but they still work fine when added directly to your project routes.rb file.