How can I make my ExFAT partition unmount cleanly?

I've got Raspbian running on a Raspberry Pi 4 B. I have a USB hard disk that I'm using with it. The hard disk is a 1TB drive formatted with a single partition using ExFAT. I've got exfat-fuse and exfat-utils installed. The problem is that every time I unmount the partition, when I run fsck on that partition, it gives me this warning:

WARN: volume was not unmounted cleanly.

That makes me nervous. This happens no matter how the partition is unmounted. It happens on shutdown and subsequent bootup, it happens on reboots, it happens if I just manually sudo umount /dev/sda1 and sudo mount /dev/sda1 Here's some system information:

Linux rpi4b 4.19.97-v7l+ #1294 SMP Thu Jan 30 13:21:14 GMT 2020 armv7l GNU/Linux

exfat-fuse/stable,now 1.3.0-1 armhf [installed]
exfat-utils/stable,now 1.3.0-1 armhf [installed]

This is the line concerning the partition in my /etc/fstab.

UUID=BE1B-4EFA  /media/BE1B-4EFA      exfat   defaults,auto,users,rw,nofail  0       0

Why isn't my partition unmounting cleanly? How can I make sure it does?