Man pages matching name io::capture::tie_stdx in section 3pm:

IO::Capture::Tie_STDx.3pm.en	debian 10 / libio-capture-perl
IO::Capture::Tie_STDx.3pm.en	debian 11 / libio-capture-perl
IO::Capture::Tie_STDx.3pm.en	debian 12 / libio-capture-perl