loop is stopped after r2 is complete and r1 is not finished

ractor_play.rb

r1 = Ractor.new do
  1.upto(10) do |i|
    sleep(0.2)
    Ractor.yield i
  end
end 
 
r2 = Ractor.new do
  11.upto(15) do |i|
    sleep(0.2)
    Ractor.yield i
  end
end 
 
loop do
  _, obj = Ractor.select(r1, r2)
  puts obj
end

r1 = Ractor.new do
  1.upto(10) do |i|
    sleep(0.2)
    Ractor.yield i
  end
end 
 
r2 = Ractor.new do
  11.upto(15) do |i|
    sleep(0.2)
    Ractor.yield i
  end
end 
 
ractors =  [r1, r2]
loop do
  _, obj = Ractor.select(*ractors)
  puts obj
rescue Ractor::ClosedError => ex
  ractors.delete_if { |ractor| ractor.inspect =~ /terminated/ }
  raise if ractors.empty?
end