Yann Dirson <y...@blade-group.com> added the comment:

> The fact that my stdout object has no read1() and needs the above patch looks 
> like a good lead for further investigation?

That's linked to universal_newlines, the bug only shows when that flag is set.

Testcases provided in https://github.com/python/cpython/pull/25859

----------
title: Undocumented behaviour change of POpen.stdout.readine with bufsize=0 or 
=1 -> POpen bufsize=0 ignored with universal_newlines=True

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41222>
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