Recipe install command prints out to stdout and not error, but RecipeTestTrait::applyRecipe() only prints out error output

I have also run into this problem that an error only appeared on STDOUT and not on STDERR but that has not been reported by Recipe installer.

With original implementation it was extremely painful for us figuring out that part of the Drupal 11.2.0 update an assert breaks in our code since the assertion error was only visible on stdout. "Failed asserting that 1 is identical to 0." was also not really helpful, so it got also improved in the MR.

STDOUT:
[notice] A backup checkpoint was not created because nothing has changed since the "Backup before the 'Foo' recipe." checkpoint was created.
AssertionError: assert(property_exists($index, 'original')) in assert() (line 51 of /mnt/files/local_mount/drupal/modules/foo/src/Bar.php).


STDERR:
0/7 [░░░░░░░░░░░░░░░░░░░░░░░░░░░░]
Applying recipe

1/7 [▓▓▓▓░░░░░░░░░░░░░░░░░░░░░░░░]
Installed Image module.

2/7 [▓▓▓▓▓▓▓▓░░░░░░░░░░░░░░░░░░░░]
Installed Comment module.

3/7 [▓▓▓▓▓▓▓▓▓▓▓▓░░░░░░░░░░░░░░░░]
Installed Database Search module.

4/7 [▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓░░░░░░░░░░░░]
Installed Database Search Defaults module.


Failed asserting that 1 is identical to 0.
/mnt/files/local_mount/build/web/core/tests/Drupal/FunctionalTests/Core/Recipe/RecipeTestTrait.php:89
/mnt/files/local_mount/drupal/recipes/Foo/tests/src/Funtional/BarTest.php:54

Looks good, tested.

The patch saved the day today again, because it helped with identifying a missing dependency inside a recipe that was completely hidden before the patch, what we have seen is just 1 !== 0 and recipe application failed.

Process exit code mismatch.
Expected: 0
Actual: 1

STDOUT:
Error: Call to a member function getConfigDependencyName() on null in Drupal\Core\Entity\EntityDisplayBase->calculateDependencies() (line 302 of /var/www/html/build/web/core/lib/Drupal/Core/Entity/EntityDisplayBase.php).

Committed edbbe5c and pushed to 11.x. Thanks!
Committed c70b768 and pushed to 11.2.x. Thanks!

More information to help people makes sense.