This looks like something specific to the snap package.
Snap versions:
client: 1.2.16
app: 1.2.7
The snap package also has to be installed with the
--classic
flag e.g.
snap install screen --classic
Installing the .deb package 1.2.7 works as expected.
$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=20.04
DISTRIB_CODENAME=focal
DISTRIB_DESCRIPTION="Ubuntu 20.04 LTS"