Hey, this is my first time contributing.
I have not changed the docs, because the fixed behavior is intended and was already documented.
I was not able to write a reproducing test in "test_build.py" as this seems to circumvent the "application.py" module.
Also a nested src folder is needed as shown in the issue.
The simplest way to reproduce the issue is to check out the poetry repo and try: "poetry build -C ."

I added a test, which was a bit tricky for sure. You have to choose ApplicationTester instead of CommandTester (in comparison to the other tests in test_build.py) because the latter initializes Poetry before the directory is passed. But even when using the correct tester class, at first, I was not able to reproduce the issue because of #9444.

@radoering nice! thanks for the help

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