The model of redstone wire has gaps

This is because some redstone wire’s block states models are “fake“

Those models are generated by combining simpler models, in this case east-west, north-south and none (as you can see from the attached images).

So once those models are put one on top of the other, they give the illusion of it being one singular texture. However, the rendering part is tricky: you have to put on the same level all the three textures, without having a z fighting.

So, i think that if they are going to fix this bug, they are going to simply make a texture for each block state.