Make /mnt mount display as partition

I mounted my secondary partition in /mnt (since /mnt is used for manually mounted partition and since it's same disk that system running on) but thunar doesn't display it as partition I tried some file managers before like nautilus and dolphin all show /mnt mounted as partition

Version information

4.20.3 archlinux

Steps to reproduce

1. Mount partition to /mnt

Current behavior

manually mounted partition doesn't show as partition

Expected outcome

display manually mounted partition in /mnt as partition