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It is generally not recommended to do distro (Debian) major version upgrades. I mean in most cases it works well, perhaps some manual config adjustments required but nothing urgent. But in rare cases issues CAN be much larger. For this reason no distro would ever automate this upgrade, nor support it, neither do we.
If you want to take the risk, see: https://dietpi.com/forum/t/qbittorrent-version-shipping-with-dietpi/2326/9
I will see if I can sum up all relevant information in our Wiki or here in a sticky thread + give some more details about which software titles would definitely require a reinstall due to distro specific packages/configs outside of what APT does.
We will neither officially support this, nor invest much time to do individual support if issues occur. However as many users will do it regardless, it makes sense to help with useful information to avoid them running into issues that are expected to occur in the first place.