Last result special variable _ sometimes returns second to last result at the end

[bo-tato]

if you start pry with: pry -e 'END {puts "last result was: #{_}"}'
if I exit pry with Control-D (EOF) it prints the second to last result:

[2] pry(main)> 1
=> 1
[3] pry(main)> 2
=> 2
[4] pry(main)> 3
=> 3
[5] pry(main)> ^D
last result was: 2

if I exit pry with exit then it does print the actual last result. If instead of _ I use _out_[-1] then it prints the correct last result whether I exit with Control-D or exit. Am I misunderstanding _ or is this some edge case bug for it?