Tails installer doesn't show second USB stick in the droplist
I have two identical USB flash drives, one has tails 4.9 installed. I want to install it to the second one, but the installer doesn't show it in the droplist, only shows /dev/sdb1 which is the persistent volume.
I can mount / umount the second one in the terminal.
And also I can find it in Applications ▸ Utilities ▸ Disks, but it's under the same disk tag in the left bar, the title shows /dev/sdb and /dev/sdc, I only can see the partition of the first USB stick, cannot find the second one.
I tried to insert the second USB stick before and after the start of the installer, no difference.
Any ideas? Thank you.