Xubuntu + Thunar locking up mount points

hi this is about Xubuntu 20.04 with Thunar 1.8.14 on 2 pcs with similar installed software

Automount and Volume Control are disabled in Removable Devices. I have installed udftools

I am trying to install a multi-cd game in Wine. But this is a problem with understanding how Xubuntu+Thunar control mounting of removable devices Wine is set to look at /mnt/cdrom1 for D:\

On one pc I can take the cd out of the drive and then do sudo mount /dev/sr0 /mnt/cdrom1, and Wine will see the cd has changed

But on the other pc I cannot change what cd is mounted to /mnt/cdrom1

The exact commands I have entered are:-

@LINUXspare:~/Desktop$ sudo mount /dev/sr0 /mnt/cdrom1
[sudo] password for dave: 
mount: /mnt/cdrom1: WARNING: device write-protected, mounted read-only.

this command has successfully mounted the first cd to /mnt/cdrom1

@LINUXspare:~/Desktop$ sudo umount /mnt/cdrom1
@LINUXspare:~/Desktop$ sudo mount /dev/sr0 /mnt/cdrom1
mount: /mnt/cdrom1: WARNING: device write-protected, mounted read-only.

And before entering the second cd I can remove the cd and re-mount it

@LINUXspare:~/Desktop$ sudo umount /mnt/cdrom1
umount: /mnt/cdrom1: target is busy.
@LINUXspare:~/Desktop$ sudo umount -l /mnt/cdrom1

I think when WINE is looking at the mountpoint it becomes busy and has to be unmounted with -l

@LINUXspare:~/Desktop$ sudo mount /dev/sr0 /mnt/cdrom1
mount: /mnt/cdrom1: /dev/sr0 already mounted or mount point busy.

The second cd will not now mount to /dev/cdrom1

@LINUXspare:~/Desktop$ sudo mount /dev/sr0 /mnt/cdrom1

If I now close WINE the mount command hangs

What is going on and why is it so different on the 2 pcs?