No recent backup, but there is

Hello there. I’ve seen similar problems to this, but haven’t seen any solution. So the problem: one of subclients shows that there is no recent backup, but actually there is. No errors in log.

How to reproduce:
Create new client
Create new sub client
Separate settings for sub client
No differential backups, only full backups every day
Make full backup - and see the result.

I tried to enable differential backup and make it and it worked, no more “No recent backup” in this sub client, but I don’t need differential backups.