Iftop does not exit after -s <number> of seconds if -f flag is used

[Yuva]

sudo iftop -i bond0 -B -F 10.10.34.2/255.255.255.255 -t -s 5
interface: bond0
IP address is: 10.10.32.242
MAC address is: <>
Listening on bond0

Exits after 5 seconds

sudo iftop -i bond0 -B -F 10.10.34.2/255.255.255.255 -f 'src port 8080' -t -s 5
interface: bond0
IP address is: 10.0.32.242
MAC address is: <>
Listening on bond0

The above command does not exit after 5 seconds - this seems to be due to additional -f flag added.

Additional details

1. lsb_release -rd
Description: Ubuntu 20.04.4 LTS
Release: 20.04

ubuntu@vm-machine:~$ uname -a
Linux vm-machine SMP Wed Sep 21 13:51:21 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

2. Iftop version 1.0pre4
apt-cache policy iftop
iftop:
  Installed: 1.0~pre4-6build1
  Candidate: 1.0~pre4-6build1
  Version table:
 *** 1.0~pre4-6build1 100
        100 /var/lib/dpkg/status

3. What you expected to happen : Exit after 5 seconds
4. What happened instead : Does not exit after 5 seconds.

This is inside a vmware virtual machine.