follow mode not working

[cipitaua]

I'm on debian-sid, and I redirect the output of a code into a file. When I less this file, and then I press "shift+f" to follow the content, after reaching the end of the file it does not keep following it when new data is appended (it behaves the same as "shift+g"). I don't encounter this problem on another system (an old centos7).

As side note, the piping into less seems to work, e.g. the following command

for i in {0..10000}; do echo "$i"; sleep 0.1; done | less +F

works as expected. But passing through a file does not.