invalid instruction when referencing overridden private interface types

[Blacksmoke16]

# test2.cr
module OtherInterface; end

private record One do
  include OtherInterface
end

private record Two do
  include OtherInterface
end

([One.new, Two.new] of OtherInterface) == [One.new, Two.new]

Then:

# test.cr
require "./test2"

module OtherInterface; end

private record One do
  include OtherInterface
end

private record Two do
  include OtherInterface
end

pp [One.new, Two.new] == [One.new, Two.new]

Results in:

$ crystal test.cr
Program exited because of an invalid instruction

If I had to guess, I'd say something regarding the "private to the file" thing isn't working out exactly as we expect giving one or the other files a reference to the other?

Originally posted by @Blacksmoke16 in #14447 (comment)