This makes it literally impossible for you to make a texturepack to bring back the old redstone dot.
Comments 6
It definitly is a bug, I can't imagine any reason why mojang would intentionally want to limit creativity.
For suggestions, please visit Minecraft Suggestions on Reddit or visit the Feedback website.
Please read the changelog, both versions of redstone are now available in-game: https://www.minecraft.net/en-us/article/minecraft-snapshot-20w21a