"out of pty devices" on Centos 7

[gatlanticus]

Environment

I installed poetry on Centos 7 using the linux installer and python 3.11.

Behaviour

After installation, poetry --version returned "Poetry (version 1.8.2)".
poetry install ran successfully on my project.

However, subsequent usage of poetry shell return an error: "out of pty devices"

Expected behaviour

Since sysctl kernel.pty.nr showed only one active pty session, poetry should not have run out of pty devices.