This issue is still happening on charm version 73 during upgrade from octopus to pacific (cloud:focal-victoria -> cloud:focal-wallaby). I guess this happens due to no upgrade path defined on https://github.com/openstack/charm-ceph-mon/blob/1a24e5edc5e00e6a7adccc6f444fc723b10d750e/lib/charms_ceph/utils.py#L3165
This issue is still happening on charm version 73 during upgrade from octopus to pacific (cloud: focal-victoria -> cloud:focal- wallaby) . I guess this happens due to no upgrade path defined on https:/ /github. com/openstack/ charm-ceph- mon/blob/ 1a24e5edc5e00e6 a7adccc6f444fc7 23b10d750e/ lib/charms_ ceph/utils. py#L3165