I may have found another bug in Pico-8, @zep.

Try out this code:

function count()
  for i=1,100 do
    print(i)
    flip()
  end
end

Run. Nothing happens as expected. Now type out: count() followed by ENTER.

Try to press "P" to pause it. It will not pause. However if you call this function in the main part of your code or make this the main part of your code, then it DOES pause correctly.