DHCP Server vs firewall

Hello all,
I have question about DHCP server running on Mikrotik. When I configure DHCP server on specific interface and create one rule in firewall - drop all input - dhcp still works and my computer gets ipv4 address.
How is it possible? Could you please explain?
Thank you.

Maybe you should share your config export…

Impossible to block DHCP Server. By design, or bug???

TL;DR summary: raw sockets