F32 UEFI reboot complete OK if 'cold/hard'; but 'warm/soft' reboot hangs after Grub menu entry is selected ?

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I've built up an older box (ASRock J1900D2Y mobo), on Fedora32 + kernel 5.8.18 + grub 2.04 (from F32 pkgs), booting UEFI.

I can cold boot -- or hard reboot -- the box, and it boots to desktop with no problems.
Afaict, everything's up & running without issue.

But,

on SOFT reboot -- via either `shutdown -r now` or `systemctl start reboot.target`,
the system DOES start the reboot.
UEFI boot passes to grub menu as usual, latest kernel is selected, and then ...
... nothing.

Just sits there.  No further error logging, or progress -- even at serial console with kernel/systemd debug logging turned up.

A cold, power-cycling reboot immediately fixes the problem -- e.g., after an IPMI 'Reset', the system again boots fine.

Since cold boot is OK, seems kernel & initrd are ok.

Since the issue arises only AFTER grub menu's in the picture, it doesn't seem that BIOS/UEFI should be involved in any way.

Any hints as to where to dig around next? Or suggestions how to workaround?
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