bundler misses the definition to itself by resolving remotly

Hello!
I am using ruby 2.7 and bundler 2.3.22.
In my case the Gemfile lists bundler among other gems. The definition of gems are resolved remotely. However, remote resolver returns the definition of each gem except bundler. In previous bundler version 2.3.18 the remote resolver returned the list of gems included bundler.

For test purposes Gemfile and test script were created.

Gemfile

source 'https://rubygems.org'
ruby "~> 2.7.0" if respond_to?(:ruby)
group :default do
  gem "bundler",
                                         ">= 0"
  gem "concurrent-ruby",
                                         ">= 0"
  gem "concurrent-ruby-ext",
                                         ">= 0"
  gem "facets",
                                         ">= 0"
end

test.rb

require 'bundler'

gems_definitions = Bundler::Definition.build("Gemfile", nil,nil)

print "REMOTLY \n"
gem_specs = gems_definitions.resolve_remotely!
gem_specs.each do |spec|
  print "#{spec.name}  --- #{spec.version} \n"
end

print "----------------------------\n"

print "SPECS \n"
specs_init = gems_definitions.specs
specs_init.each do |spec|
  print "#{spec.name}  --- #{spec.version} \n"
end

output of bundler 2.3.22

REMOTLY
concurrent-ruby  --- 1.1.10 
concurrent-ruby-ext  --- 1.1.10 
facets  --- 3.1.0 
----------------------------
SPECS 
bundler  --- 2.3.22 
concurrent-ruby  --- 1.1.10 
concurrent-ruby-ext  --- 1.1.10 
facets  --- 3.1.0 

output of bundler 2.3.18

REMOTLY 
bundler  --- 2.3.18
concurrent-ruby  --- 1.1.10 
concurrent-ruby-ext  --- 1.1.10 
facets  --- 3.1.0 
----------------------------
SPECS 
bundler  --- 2.3.18 
concurrent-ruby  --- 1.1.10 
concurrent-ruby-ext  --- 1.1.10 
facets  --- 3.1.0 

Start by running the supplied test.rb with the Gemfile against the affected Bundler version, comparing resolve_remotely! with specs. Trace the remote resolution entry point from the Bundler code and determine why the bundler definition is omitted; done means the remote results include bundler as they did in 2.3.18, with a regression test covering the case.