What are these empty directories under /mnt?

Every time I reboot my TrueNAS Scale system, I’m noticing that an empty directory is created under /mnt:


These folders are suffixed with a 4 character UUID + a timestamp.

“Sonic” is the dataset I’m using for my Applications. I think it might be related to that as the only thing inside of these two folders is another folder called “ix-applications”.

Does anyone know why these folders are being created and/or what they are used for?