A fresh MicroOS installation via YaST (MicroOS role) shows an extra snapshot2
that is not the default one:

# snapper ls -a
 # | Type   | Pre # | Date                     | User | Used Space | Cleanup |
Description           | Userdata     
---+--------+-------+--------------------------+------+------------+---------+-----------------------+--------------
0  | single |       |                          | root |            |         |
current               |              
1* | single |       | Wed Nov  3 09:36:13 2021 | root |  11.86 MiB |         |
first root filesystem |              
2  | single |       | Wed Nov  3 09:38:32 2021 | root |  10.16 MiB | number  |
after installation    | important=yes


After the first boot seems that the difference is only in the SElinux labels.
The default one (1) currently have the labels, and not the second one (this is
expected)

# btrfs send --no-data -p /.snapshots/1/snapshot /.snapshots/2/snapshot | btrfs
receive --dump | less
(bunch of selinux and access time diffs)

IMHO YaST / snapper should not create this second snapshot, as can cause
confusion later during cleaning / rollback.