[imgur]https://i.imgur.com/UAm6itr[/imgur]
The default DOOM2 lump is "M_OPTTTL":

I made a replacement lump with the same name:

But nothing changes in-game. It's still using the default graphic from Doom2. I've had no problems with any other menu graphic except this one. What is going on?
EDIT: Just notice that the OPTIONS title in the options menu DOESN'T use the M_OPTTTL graphic, but just red Bigfont. In that case, how do I replace the Bigfont from my wad?