Bug#995856: "sysread() isn't allowed on :utf8 handles at /usr/share/perl5/Expect.pm line 849."

[Joergen Haegg]

> JFI: the same happens with upstream 1.35;
> I could work around the problem via LC_ALL=C.

Hmm, strange. So a new version would not help.

Maybe this has some connection to your problem?
https://github.com/perl/perl5/issues/14839