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This lighting bug occurs with indium and continuity installed
(#212)

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Backport the fix to 1.20.1
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Seconded, as I'm also using both on 1.20.1 and experiencing this. I know Indium isn't technically required anymore but a lot of mods still list it as a hard dependency and refuse to load without it. I also tried Sodium Dynamic Lights but they still have this issue too.

LambDynamicLights v4.0.2+1.20.1 is now out, which should fix this.