Emissive trident doesn't work properly in emissive resource pack.
It works when you hold it in hand but it stops glowing in item frame or when you drop it.

also it seems you commented for that resource pack as well

ETF only does the emissives and variations for the thrown and held trident entities, you will need the continuity mod's 2.0 update for emissive items and blocks.

ETF for entities and entity models & continuity for blocks and regular items, are both required for you have everything emissive

While this isn't an ETF issue, I have helped Indigo and Indium resolve this, which will allow it to work correctly with Continuity. Fabric API 0.56.1 and Indium 1.0.6 for 1.18.2/1.19 contain the fix.