hibernation is restricted; see man kernel_lockdown.7
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The Kernel Lockdown feature is designed to prevent both direct and indirect access to a running kernel image, attempting to protect against unauthorized modification of the kernel image and to prevent access to security and cryptographic data located in
kernel memory, whilst still permitting driver modules to be loaded.
If a prohibited or restricted feature is accessed or used, the kernel will emit a message that looks like:
Lockdown: X: Y is restricted, see man kernel_lockdown.7
where X indicates the process name and Y indicates what is restricted.
On an EFI-enabled x86 or arm64 machine, lockdown will be automatically enabled if the system boots in EFI Secure Boot mode.