I was also bitten by this bug with the Debian bookworm alpha1 era installer. This is not a wishlist kind of bug; This is a bug of grave severity. Breaking hibernation is unacceptable and is a key feature of modern operating systems for both laptop and desktop users. If the idea behind the 1GB default is to cater to the server world, then somewhere the installer needs to either prompt the user to say what kind of installation it is (desktop or server) or to offer a choice between the two camps so the installer picks better defaults.
I completely don't understand the comments about hibernation not working on x86. I'm going to disregard that unless there's a clarification. Thanks to Johannes (in Message #30) for suggesting a solution. Other workarounds found on the web suggest tinkering with systemd's SYSTEMD_BYPASS_HIBERNATION_MEMORY_CHECK variable and re-configuring the GRUB menu (see https://bbs.archlinux.org/viewtopic.php?pid=1928690#p1928690). I haven't tried these yet but the Debian installer shouldn't burden users with such low-level tinkering. This is going to push potential Debian users to other distros after they discover hibernate doesn't work.