In earlier versions of lsof, -F p printed only the pid:

$ sudo lsof -i tcp:22 -s tcp:LISTEN -F p
p677
$ rpm -q lsof
lsof-4.87-6.el7.x86_64

Newer versions print filehandles also, which breaks scripts parsing this output:

$ sudo lsof -i tcp:22 -s tcp:LISTEN -F p
p609
f5
f6
$ rpm -q lsof
lsof-4.93.2-3.fc32.x86_64

Is this behavior change intentional?