There is a NX problem indeed. You were right from the start :)
efibootmgr -v output from shell:
BootCurrent: 0000
Timeout: 1 seconds
BootOrder: 0000,0003
Boot0000* Ubuntu
HD(1,GPT,64038958-7a20-4179-88a7-e67f851bfaa4,0x800,0x100000)/File(\EFI\UBUNTU\SHIMX64.EFI)
dp: 04 01 2a 00 01 00 00 00 00 08 00 00 00 00 00 00 00 00 10 00 00 00 00
00 58 89 03 64 20 7a 79 41 88 a7 e6 7f 85 1b fa a4 02 02 / 04 04 34 00 5c 00 45
00 46 00 49 00 5c 00 55 00 42 00 55 00 4e 00 54 00 55 00 5c 00 53 00 48 00 49
00 4d 00 58 00 36 00 34 00 2e 00 45 00 46 00 49 00 00 00 / 7f ff 04 00
Boot0003* Windows Boot Manager
HD(1,GPT,64038958-7a20-4179-88a7-e67f851bfaa4,0x800,0x100000)/File(\EFI\MICROSOFT\BOOT\BOOTMGFW.EFI)0000424f
dp: 04 01 2a 00 01 00 00 00 00 08 00 00 00 00 00 00 00 00 10 00 00 00 00
00 58 89 03 64 20 7a 79 41 88 a7 e6 7f 85 1b fa a4 02 02 / 04 04 46 00 5c 00 45
00 46 00 49 00 5c 00 4d 00 49 00 43 00 52 00 4f 00 53 00 4f 00 46 00 54 00 5c
00 42 00 4f 00 4f 00 54 00 5c 00 42 00 4f 00 4f 00 54 00 4d 00 47 00 46 00 57
00 2e 00 45 00 46 00 49 00 00 00 / 7f ff 04 00
data: 00 00 42 4f
** Attachment added: "Debug output when booting w10."
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/2078307/+attachment/5826593/+files/PXL_20241009_180946305.jpg
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https://bugs.launchpad.net/bugs/2078307
Title:
Grub 2.12 in Oracular is unable to boot Windows using chainloader
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