Comment # 3 on bug 1190290 from Julie Cao

Just tried, there was no problem in snapshot 20210820. the xen entries got lost
 between 20210821 and 0904.

# grub2-once --list
     0 openSUSE Tumbleweed
     1 Advanced options for openSUSE Tumbleweed>openSUSE Tumbleweed, with Linux
5.13.12-1-default
     2 Advanced options for openSUSE Tumbleweed>openSUSE Tumbleweed, with Linux
5.13.12-1-default (recovery mode)
     3 openSUSE Tumbleweed, with Xen hypervisor
     4 Advanced options for openSUSE Tumbleweed (with Xen hypervisor)>Xen
hypervisor, version 4.15.0_01-2>openSUSE Tumbleweed, with Xen 4.15.0_01-2 and
Linux 5.13.12-1-default
     5 Advanced options for openSUSE Tumbleweed (with Xen hypervisor)>Xen
hypervisor, version 4.15.0_01-2>openSUSE Tumbleweed, with Xen 4.15.0_01-2 and
Linux 5.13.12-1-default (recovery mode)
     6 Start bootloader from a read-only snapshot> openSUSE Tumbleweed 
(5.13.12-1,2021-09-08T10:08,post,zypp(zypper))
...
    11 Start bootloader from a read-only snapshot> openSUSE Tumbleweed 
(5.13.12-1,2021-09-08T09:38,pre,zypp(zypper))
    12 Start bootloader from a read-only snapshot>*openSUSE Tumbleweed 
(5.13.12-1,2021-09-08T09:32,after installation)