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Full disk encryption - Hibernation and unlocking
(feddit.org)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Not sure about Debian, but on Arch Linux, hibernation with FDE works perfectly on my Framework laptop. It took a little to setup; I use a swapfile for my swap. And it exists on my encrypted drive. You know your use case best,I found for my usecase, a separate swap partition (to say nothing about two separate ones) was restrictive and unnecessary. A swapfile works well and lives on an encrypted drive. No need to tinker too much beyond that. Check out the Arch wiki, it might not align 100% with Debian but those wikis are super informative and can teach you how the process works so you can apply to Debian.
https://wiki.archlinux.org/title/Dm-crypt/Swap_encryption#With_suspend-to-disk_support