That's because MSFT doesn't really do hibernate any more but does "modern sleep" where it functions like a phone with the screen off. It keeps active network connections, downloads patches and keeps checking for notifications and other such nonsense.
BIOS support for proper hibernation has been getting worse too because with MSFT demanding it, there is little reason to continue support.
I've had older laptops that do the sleep->hibernate setup without too much issue but now it is a crap-shoot on if it is even supported in the hardware.
That's because the goal is not to have functional hibernation, but to start up faster. If the goal can be achieved by using less power instead of shutting down the whole machine and restoring it identically and that's easier it's a valid alternative.
You used to be able to edit ACPI tables to reenable S3 sleep but these days they're stripping the functionality from firmware entirely.
For example, HP's enterprise lines have S3 stubs in their firmware. If you enable them, nothing happens, because someone deliberately removed the S3 blobs entirely.
