Emissive Textures Not Rendering

[CCjun6]

First, when I use a Forge + OptiFine 1.21.8 client to load my emissive texture pack, it works correctly and the emissive effect displays properly.
However, when I switch to a Fabric 1.21.8 client with Entity Texture Features (ETF) and Continuity installed, the same texture pack fails to render emissively —
I have also tested this on Minecraft 1.21.11, and the issue persists: the emissive textures still do not work as expected.

[CCjun6]

As a follow-up, I just tested it on version 1.21, and it works properly there — it glows normally.

[PepperCode1]

The feature is missing on all versions for Minecraft 1.21.5 or higher. It will be re-added soon.