When the Warden applies the darkness potion effect to you in a completely dark environment and you look at the chat, it darkens at the same time as the darkening effect. Additionally, if you give yourself an item (e.g., an apple) using /give while you have the darkening effect, it will also begin to darken.
The expected thing is that everything does not go dark and works normally.
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This is still present in Minecraft 25w35a. In a few hours, I'll try to ask someone to help me record the bug so you can see it better and fix it.
Confirmed.