In making a few emissive resourcepacks for this mod, I noticed more and more that Mojang have implemented their own emissive behaviour for certain mobs, here is a rough list:

• Allay
• Vex
• Blaze
• Spider eyes
• Enderman eyes
• Magma cube
• Phantom eyes
• Wither
• Beacon/end gateway beam

(There may be more but these are the ones that I noticed)
My suggestion is to add a mod setting that allows disabling this behaviour, allowing for emissive resourcepacks to work on these entities as well.
Unfortunately I am not equipped enough with Java knowledge to attempt this myself, nor to know how difficult this would be, but I think it could add some value to this amazing mod :)

For spider, endermen and phantoms eyes you can always just make the eye texture blank.

The others however are a good idea I will try and add an option

It looks so strange :)

blaze is chilly :)

Added in dev build 4.1.1.dev.3
the suggestion here will remain open until the feature is in a stable release

Download for the dev build is in the dev blog on my discord

Documentation for the feature is in the below link on line 308

https://github.com/Traben-0/Entity_Texture_Features/blob/1.19-dev/.github/README-assets/random_entities.properties

fixed or added in release 4.2