[server] Nested virtualization in 2023

Does anybody succedeed to run some latest ubuntu versions in nested virtualization way recently?

I try on an hp proliant gen10 with xen base and on my laptop (for testing purpose) with virtualbox 7 over windows 11 (both platform run on Intel CPU). The result is the same on both platform :
- Virtualized Host Ubuntu 18.04 -> Guest Ubuntu 20.04 and 22.04 : Guest doesn't start and CPU is 100% busy
- Virtualized Host Ubuntu 20.04 -> Guest Ubuntu 20.04 and 22.04 : Host crash, litterally
- Virtualized Host Ubuntu 22.04 -> Guest Ubuntu 20.04 and 22.04 : Guest doesn't start and CPU is running 10-12%

Each test has been perform with an up to date version of ubuntu.
I check configuration and it should be ok : vmx flags ok in Host, kvm-ok is happy, virt-host-validate does not complain. kvm and kvm_intel module are well loaded.
The worst part : I don't have any log to provide... qemu start and nothing... No log, no qemu crash. I try to to force qemu to write log with -D flag, but nothing in the file.

I launched kvm-stat but I don't have the knowledge to understand the output.

I can provide log, trace, anything which could make it functionnal