Hi, have you actually tested that this works?
On three buildds, mksh FTBFS already because the whole /dev/ptmx and /dev/pts stuff is malfunctioning again, after like 15 years of it working after having had to fight for packages being allowed to depend on it to obtain a pty/tty for tests during build with script(1). Not sure it’s related, jrtc27 pointed out it’s a recent change that might be, and cbmuser would be the one to recreate the chroots there. I have about negative band‐ width to debug this myself right now, so… please.