The T junction, cross and corner redstone dust have gaps between their pixels, either on or off. Diferent video settings do not appear to affect the rendering.
MC-305159
Redstone dust has faulty rendering
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2
It is a common issue in Minecraft that had a place for a long time. It’s kind of bug that cannot be fixed directly. This mod removes the problem completely. https://modrinth.com/mod/modelfix