Acronis 2021 confused about Old Version Cleanup

Acronis seems to have problems managing old backups. I have automated backups of my logical drives, and when they get to the maximum allowed size of the backup, instead of deleting the oldest backup, Acronis stalls and waits for a console input. How do you convince it not to stop and wait for an input?
Note that I don't do ANYTHING to the backup drive other than mount it for the backup runs. Acronis should be able to manage the space allocation without stopping. When I get the stop, I select cancel since retry is pointless. The backup continues and successfully completes.
What's going on?
Typical error I see:
Archive E-Drive task is waiting for user interaction. Description: Information: Failed to open backup U:\Drive_E_Backup\Archive E-Drive_diff_b2_s3_v1.tib. Make sure the backup location is accessible and contains all versions of the backup. Details: If you moved or renamed it, return it to the same location or restore the initial file name, respectively, and then click Retry.
Some further information.
Here's the error screen, what's in the backup folder, and the option set for automatic cleanup. It's obvious from the folder that the automatic cleanup previously removed the old file they're now looking for. Since these are all full backups, I fail to see why it's an issue, this seems to be simply a flaw in their automatic cleanup. I don't know, but I'd think after all these years, something this simple could have been perfected!
Attachment | Size |
---|---|
___TI Error N1_0.png | 12.21 KB |
___TI Error N2_0.png | 75.26 KB |
___TI Error N3_0.png | 24.73 KB |

I suspect you're right, I'll change from the size to the number of backups. Since I am doing full backups for all these datasets, it shouldn't get confused about incremental or differential parts, there aren't any! :)
I've configured it with the number of backups, I notice my other series of backups were already configured that way, and I've never seen the error. Obviously, the "size" option is less than perfect! ;)
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