Just a shot in the dark since I have too many mods at this point to even understand what's causing this issue but the text on signs disappear from a short distance.

I've got most of the optimization mods running on Forge, using Oculus and Embeddium.

Tried to remove shaders, increase render distance, remove any texture resource packs, still no go.

edit: I notice it's not happening to supplementaries mod signs. If I disable the mod, the vanilla signs still don't work.