Bug#1117574: openssh-client: output pauses in interactive session over ControlMaster

Package: openssh-client
Version: 1:10.1p1-1
Followup-For: Bug #1117574

Was hit by this issue this morning too.

-- System Information:
Debian Release: forky/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 6.16.9+deb14-amd64 (SMP w/4 CPU threads; PREEMPT)
Locale: LANG=fr_FR.utf8, LC_CTYPE=fr_FR.utf8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages openssh-client depends on:
ii  adduser              3.153
ii  init-system-helpers  1.69
ii  libc6                2.41-12
ii  libedit2             3.1-20250104-1
ii  libfido2-1           1.16.0-2
ii  libgssapi-krb5-2     1.21.3-5
ii  libselinux1          3.8.1-1
ii  libssl3t64           3.5.4-1
ii  passwd               1:4.18.0-1
ii  zlib1g               1:1.3.dfsg+really1.3.1-1+b1

Versions of packages openssh-client recommends:
ii  xauth  1:1.1.2-1.1

Versions of packages openssh-client suggests:
pn  keychain      <none>
pn  libpam-ssh    <none>
pn  monkeysphere  <none>
ii  ssh-askpass   1:1.2.4.1-16+b1

-- no debconf information