Disowned command killed when piping NUL character

[Johan Grande <nahoj@xxxxxxxxx>]

I notice the following inconsistency in behavior. Is it indeed a bug? 
The async job with the \0 doesn't print "hello" while the other two 
commands do.

% { print |read line; echo hello } &!
% hello

% { print '\0'|read -d $'\0' line; echo hello } &!
% print '\0'|read -d $'\0' line; echo hello
hello

With zsh 5.8.1 (x86_64-ubuntu-linux-gnu) and an empty ~/.zshrc.

--
Johan