lvm device not created in /dev directory

[duxsco]

Afaik lvm devices are created in the /dev directory and a symlink is created in /dev/mapper thats point to that lvm device:

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latitude ~ # ls -la /dev/mapper/vg-*
lrwxrwxrwx 1 root root 7  8. Dez 16:10 /dev/mapper/vg-root -> ../dm-4
lrwxrwxrwx 1 root root 7  8. Dez 16:10 /dev/mapper/vg-swap -> ../dm-3

But, from one day to another the lvm device vgroup-root, which holds the operating system, is created directly in /dev/mapper on bootup:

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latitude ~ # ls -la /dev/mapper/vgroup-*
brw------- 1 root root 254, 1  8. Dez 15:28 /dev/mapper/vgroup-root

In /etc/lvm/lvm.conf the line scan = [ "/dev" ] is set. Therefore, pvdisplay, vgdisplay and lvdisplay doesn't show the device, that was created in /dev/mapper, making the creation of snapshots impossible. This can be solved by changing that line to scan = [ "/dev", "/dev/mapper" ].

I am wondering why the creation of lvm devices changed. How do I regain the old behavior?