LVM volume won't be removed , no process running

[Whisper40]

I will try to explain the problem as best I can.
I want to delete the volume of a user.
To do this I use a script that takes care of the operation.
Unfortunately, each time the script performs its task, the error reported by lvm is "contains a filesystem in use".
When I run the same script again, this time the lvm is deleted.

My manual tests :

sudo umount /home/whisper40/data/test -> OK
sudo lvremove --yes "/dev/vg_home/test"
  Logical volume vg_home/test contains a filesystem in use.

sudo dmsetup info -c | grep test
-> vg_home-test                 254  10 L--w    1    1      0 LVM-dA5m1HXcQcRHMKuSYfcLtwA0sUUEUN3XmVYkf2wZfBXPKqcexFNGfHAyefTZ2XqH
sudo lsof | grep "254,10" -> No result at all ! so no process

sudo lvremove --yes "/dev/vg_home/test"
  Logical volume vg_home/test contains a filesystem in use.

LVS result : test vg_home Vwi-aotz-- 100.00g pool_0_vg_home 2.34

The umount runs without indicating that a process was using the disk. LVM therefore should not block the deletion because there is no process using the disk.

This problem caused me many trouble on many servers ( Debian 9 and 10 on my side ).
Thanks if you have any idea..

[Whisper40]

Answer : The volume has to be deleted from the fstab before lvremove command. After that, working without problem !

[zkabelac]

I'd guess this is some sort of problem with Debian udev rules - which deviates from upstream. As it looks like some automounting is going behind the scene - but upon normal situation mounting shall happen only when the disk appears for in the system.