Manningham Mills (Farbic-ASM) showing up in Mod Menu about fabric-asm HOT 5 OPEN

It's not part of OptiFabric. OptiFabric bundles Fabric-ASM, but it's an independent project.
Also if you aren't already aware, there are alternatives to Optifine/OptiFabric.

from fabric-asm.

This is caused by the deprecation of the old syntax of marking mods as libraries ("modmenu:api" : true).

To mark a mod as a library in ModMenu 3+ the new syntax is:

"custom": {
    "modmenu": {
        "badges": [ "library" ]
    }
}

from fabric-asm.

That's what multiple people have told me on the Optifine Discord.
Also, I wasn't aware. I'll have a look at it - thanks. (The potential issue I am seeing with such alternatives is incompatibility with e.g. BSL shaders and such.)

Anyways, that doesn't solve the issue. I've never downloaded Manningham Mill, I've never put it in the mods folder - still it's there. Apparently (as I've been told) because it's part of Optifabric. It didn't show up in the versions for 1.16 nor for those of 1.17 - but does now in 1.18.

from fabric-asm.

So what does Manningham Mills do?
I have same problem

from fabric-asm.

So what does Manningham Mills do?
I have same problem

It's a library used by mods to alter vanilla. You have it because a mod you've installed includes it.

from fabric-asm.