Good guess. I don't see enough information to diagnose this problem, but whatever it is, I don't think it's a FreeBSD bug.
I have too little information and too few clues as to what OP is even trying to do.
I'm here to explain. Just ask and I will reply with the informations you need to diagnose the problem. Anyway,I'm not doing something special. I want to mount in rw or ro mode the disks that are attached to my PC when I use FreeBSD. Easy. I'm mounting these disks (some of them are formatted with ext4,some others with ntfs and one with ufs) using the proper command lines because when I do this using the icons that are on my desktop,I can't mount any of them. Below u can see the error that I get,that,in english language sounds like this : "can't mount Android2 ; mount: failed with". For this reason,I'm not mounting a disk two or more times. Simply I'm not trying to mount any disk clicking on the disk icon on my desktop because it does not wok. I mount every disk using the desktop manager xfce4 and I don't get errors. This is the script that I use :
lklfuse -o type=ext4 /dev/ada0s1 /mnt/ada0s1 # CT500 (466 GB / Ubuntu 21.04)
lklfuse -o type=ext4 /dev/ada1p3 /mnt/ada1p3 # Samsung SSD 860 EVO 500GB / nixos
lklfuse -o type=ext4 /dev/da1p1 /mnt/da1p1 # Toshiba (932G)
lklfuse -o type=ext4 /dev/da2s1 /mnt/da2s1 # 1.8T Toshiba
ntfs-3g /dev/nvd0p2 /mnt/nvd0p2 # Windows da 900GB
ntfs-3g /dev/da0p1 /mnt/da0p1 # Elements
ntfs-3g /dev/da3p2 /mnt/da3p2 # 1.8T Seagate
mount -t ufs /dev/ada1p2 /mnt/ada1p2 # Samsung SSD 860 EVO 500GB / FreeBSD da 100 GB
unfortunately using this method,if I want to see the content of the disks,I can do it only within the terminal. it seems that the desktop managers that I tried aren't able to display it.