Why only one VG is showing in lsblk command at a time even though all the VGs are active.

Issue

• After activating one VG, lsblk command does not show another vg and vice versa.

• While activating testvg, lsblk command does not show anothe vg (e.g. vg0)

# vgchange -ay testvg 

# lsblk
[...]
sdb             8:16   0   10G  0 disk
└─sdb1          8:17   0   10G  0 part
  └─testvg-testlv 253:2    0    9G  0 lvm    <----
sdc             8:32   0   10G  0 disk
└─sdc1          8:33   0   10G  0 part

• While activating another VG, lsblk command does not show another VG (i.e. testvg).

# vgchange -ay vg0

#lsblk
[...]
sdb               8:16   0   10G  0 disk
└─sdb1            8:17   0   10G  0 part
sdc               8:32   0   10G  0 disk
└─sdc1            8:33   0   10G  0 part
  └─vg0-lv0    253:2    0    9G  0 lvm