I load ipxe over tftp from a path (ipxe/netboot.xyz.kpxe). If I'm not mistaken (which is very possible) that's what makes this line from netboot.xyz.j2 not match:

isset ${tftp-server} && iseq ${filename} {{ bootloader_filename }}.kpxe && goto tftpmenu ||

It's not clear to me what the iseq part is supposed to be accomplishing. I am guessing there are some filenames that shouldn't go to tftpmenu, but if so I'd suggest those should be called out rather than the opposite. (And if they shouldn't be going to tftpmenu, would they ever be running in a context with tftp-server set?).

I believe this section should be replaced with just a line like:

isset ${tftp-server} && goto tftpmenu || goto menu

(at least for my use case this fixed it so I can use MAC-[mac-address].ipxe).