So I just noticed: It seems to have to do with buffering.
When I appen a lot of lines containing some "x" I received response from parent and child:
$ perl x
Start p
p: a
Start c
c: x
c: xxxxxxxxxx
p: b
c: xxxxxxxxxx
p: c
c: xxxxxxxxxx
p: d
c: xxxxxxxxxx
p: e
c: xxxxxxxxxx
p: xxxxxxxxxx
s$$([},&%#}/&/]+}%&{})*;#$&&s&&$^X.($'^"%]=\&(|?*{%
+.+=%;.#_}\&"^"-+%*).}%:##%}={~=~:.")&e&&s""`$''`"e
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