Snapshot of system indexes no longer working

Hi,
I have snapshot which saves the system files like .kibana* .
This is no longer working since one of the latest updates.
In my case with a pattern of .kibana* only .kibana-event* are saved. Nothing else.
I see that behavior on 2 stack running 8.1. On a stack running 7.16.2 anything is fine.
Maybe a bug ?

works (7.16.2)

PUT _slm/policy/daily_Kibana_and_System
{
  "name": "<kibana-system-{now/d}>",
  "schedule": "0 10 0 * * ?",
  "repository": "cc-nfs-repository",
  "config": {
    "indices": [
      ".async*",
      ".fleet*",
      ".item*",
      ".kibana_*",
      ".lists*",
      ".reporting*",
      ".security*",
      ".tasks*"
    ],
    "ignore_unavailable": true,
    "partial": true
  },
  "retention": {
    "expire_after": "30d",
    "min_count": 5
  }
}

doesn't work under 8.1:

PUT _slm/policy/weekly-kibana
{
  "name": "weekly-kibana",
  "schedule": "0 30 1 * * ?",
  "repository": "my_backup",
  "config": {
    "indices": [
      ".kibana_*"
    ],
    "ignore_unavailable": true,
    "partial": true
  },
  "retention": {
    "max_count": 8
  }
}

Best regards Uwe

Your patterns are ".kibana_*", though?

yes .kibana_*

even when I run a "All data streams and indices, including system indices" snapshot
The .kibana_* indexes are no longer saved.
So no longer a full backup possible!

sad that no one cares if you can't restore your system from the snapshot. Seems to be a bug.