When I turn off the shaders the item attached on glow item frame is distinguishable.

But, if I turn on the shaders the item attached is so bright, it becomes indistinguishable.

Even if I turn off the Glow item frame from Dynamic Light Sources: Entities, it still indistinguishable.

Perhaps, could you add options to "don't turn item attached on glow item frame as light source"?

I'm not sure how that is actually related to the mod, since you mentioned that items are still hard to see when the option is turned off?

This seems to be a shader issue.

Alright. I will find a way to config the shader then. I thought it was the mod messing with the shaders.