Proxmox Backup Server retention issue

I've got an issue with backup retention policy in PBS. Namely how `keep-hourly` works.

Documentation clearly states:

keep-hourly <N>
Keep backups for the last <N> hours. If there is more than one backup for a single hour, only the latest is kept. Hours without backups do not count.

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However it does not retain backups from last <N> hours but instead it keeps <N> backups that are newest in given hour.

Here are two cases:
1. backup is done every day, every 2 hours
2. backup is done...

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