No configuration methods succeeded

[NiKiZe]

The major points - it works out of the box with .efi build but not with .efidrv, further if dhcp runs several times it works in .efidrv as well.

you could try to do ifopen, followed by ifstat ...
but also follow the error url and check those points, I would especially dubbelcheck the last point about STP.

and of course, use tcpdump or similar on the dhcp server to catch what is going on with the communication with this client. and compare between running dhcp with delay as you did in your post, and then again with running dhcp twice fast without wait.