Version Info

• Minecraft, 1.20.1
• Fusion, fusion-1.0.3-forge-mc1.20

Are you using OptiFine: No

Description of the Bug
Smooth lighting doesn't work on connecting blocks

Steps to Reproduce
Place a light source on a connected block

Screenshots
https://media.essential.gg/e9e7ec53-2706-451b-7e4d-e5484e411200

Full mod list:
[Rechiseled: Create (by SuperMartijn642)]
[Sophisticated Core (by P3pp3rF1y)]
[Entity Culling Fabric/Forge (by tr7zw)]
[Create Slice & Dice (by possible_triangle)]
[Iris & Oculus Flywheel Compat (by leon_mout)]
[Corpse (by henkelmax)]
[Clumps (by Jaredlll08)]
[Just Enough Items (JEI) (by mezz)]
[Kotlin for Forge (by thedarkcolour)]
[FerriteCore (Forge) (by malte0811)]
[Curios API (Forge) (by TheIllusiveC4)]
[SuperMartijn642's Config Lib (by SuperMartijn642)]
[ModernFix (by embeddedt)]
[Sophisticated Backpacks (by P3pp3rF1y)]
[Inventory HUD+ (by dmitrylovin)]
[Canary (by AbdElAziz333)]
[Oculus (by Asek3)]
[Rubidium (by Asek3)]
[Jade 🔍 (by Snownee)]
[Inventory Sorter (by cpw)]
[Xaero's Minimap (by xaero96)]
[Xaero's World Map (by xaero96)]
[Create (by simibubi)]
[Fusion (Connected Textures) (by SuperMartijn642)]
[AppleSkin (by squeek502)]
[Mouse Tweaks (by YaLTeR)]
[Jade Addons (Forge) (by Snownee)]
[Rechiseled (by SuperMartijn642)]
[Sound Physics Remastered (by henkelmax)]
[Farmer's Delight (by vectorwing)]
[SuperMartijn642's Core Lib (by SuperMartijn642)]
[AI Improvements (by QueenOfMissiles)]
[ESSENTIAL Mod (by SparkUniverse_)]
[Sophisticated Storage (by P3pp3rF1y)]
[Magnesium/Rubidium Extras (by Anthxny)]
[Magnesium/Rubidium Dynamic Lights (by Anthxny)]

Thanks, this report is excellent!

Seems I accidentally set ambientocclusion to false by default for Fusion's connecting model generator, whoops. I have fixed the issue in Fusion and regenerated the model files for Rechiseled and Rechiseled: Create, so should be fixed now.
Thank you for reporting the issue!