bug69442.phpt (PTY test) is flaky

[iluuu1994]

Description

ext/standard/tests/file/bug69442.phpt frequently fails in CI:

https://github.com/php/php-src/actions/runs/20802473279/job/59750077725

Resulted in this output:

- read from pipe 0: string(5) "foo
- "
+ read from pipe 0: string(0) ""
  read from pipe 3: string(3) "42
  "

But I expected this output instead:

No error

I've observed this on macOS and PPC64.

PHP Version

Any supported version

Operating System

No response