Firejail provides secure environment that strips /dev files with little number of exception. So when I try to run screen inside the environment, I get "Must be connected to a terminal". tty responds with "not a tty".
Is it possible to get proper tty in user space and pass it to screen?
There is a way to create user mode tty with the typescript utility. It looks like an overdo, but it works. So, the simple but probably not optimal solution is:
script -c "screen -R script" /dev/null
And it would be helpful to export appropriate TERM environment variable.