Forge Version: 36.2.2
Decorative Blocks Version: 1.7.2
Supplementaries Version: 0.15.1

Something about chandeliers is causing a crash on startup. Reports have been made on Supplementaries's issue page but I thought it would be good to put it here if it ends up being on your end

---- Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.

Time: 8/9/21 11:44 PM
Description: Mod loading error has occurred

java.lang.Exception: Mod Loading has failed
at net.minecraftforge.fml.CrashReportExtender.dumpModLoadingCrashReport(CrashReportExtender.java:85) ~[forge:?] {re:classloading}
at net.minecraftforge.fml.client.ClientModLoader.completeModLoading(ClientModLoader.java:188) ~[forge:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.lambda$null$1(Minecraft.java:508) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:randompatches.mixins.json:client.MinecraftMixin,pl:mixin:APP:betterendforge.mixins.json:MinecraftMixin,pl:mixin:APP:flywheel.mixins.json:ShaderCloseMixin,pl:mixin:APP:biomancy.mixins.json:client.MinecraftMixin,pl:mixin:APP:kubejs-common.mixins.json:MinecraftMixin,pl:mixin:APP:abnormals_core.mixins.json:client.MinecraftMixin,pl:mixin:APP:immersiveengineering.mixins.json:accessors.client.MinecraftAccess,pl:mixin:APP:assets/botania/botania.mixins.json:AccessorMinecraft,pl:mixin:APP:create.mixins.json:WindowResizeMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.util.Util.func_215077_a(Util.java:320) ~[?:?] {re:classloading,re:mixin}
at net.minecraft.client.Minecraft.lambda$new$2(Minecraft.java:504) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:randompatches.mixins.json:client.MinecraftMixin,pl:mixin:APP:betterendforge.mixins.json:MinecraftMixin,pl:mixin:APP:flywheel.mixins.json:ShaderCloseMixin,pl:mixin:APP:biomancy.mixins.json:client.MinecraftMixin,pl:mixin:APP:kubejs-common.mixins.json:MinecraftMixin,pl:mixin:APP:abnormals_core.mixins.json:client.MinecraftMixin,pl:mixin:APP:immersiveengineering.mixins.json:accessors.client.MinecraftAccess,pl:mixin:APP:assets/botania/botania.mixins.json:AccessorMinecraft,pl:mixin:APP:create.mixins.json:WindowResizeMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.gui.ResourceLoadProgressGui.func_230430_a_(ResourceLoadProgressGui.java:113) ~[?:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:kubejs-common.mixins.json:ResourceLoadProgressGuiMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.renderer.GameRenderer.func_195458_a(GameRenderer.java:481) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:astralsorcery:reach_set_client_renderer,pl:mixin:APP:flywheel.mixins.json:StoreProjectionMatrixMixin,pl:mixin:APP:biomancy.mixins.json:client.GetMouseOverMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:976) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:randompatches.mixins.json:client.MinecraftMixin,pl:mixin:APP:betterendforge.mixins.json:MinecraftMixin,pl:mixin:APP:flywheel.mixins.json:ShaderCloseMixin,pl:mixin:APP:biomancy.mixins.json:client.MinecraftMixin,pl:mixin:APP:kubejs-common.mixins.json:MinecraftMixin,pl:mixin:APP:abnormals_core.mixins.json:client.MinecraftMixin,pl:mixin:APP:immersiveengineering.mixins.json:accessors.client.MinecraftAccess,pl:mixin:APP:assets/botania/botania.mixins.json:AccessorMinecraft,pl:mixin:APP:create.mixins.json:WindowResizeMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:607) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:randompatches.mixins.json:client.MinecraftMixin,pl:mixin:APP:betterendforge.mixins.json:MinecraftMixin,pl:mixin:APP:flywheel.mixins.json:ShaderCloseMixin,pl:mixin:APP:biomancy.mixins.json:client.MinecraftMixin,pl:mixin:APP:kubejs-common.mixins.json:MinecraftMixin,pl:mixin:APP:abnormals_core.mixins.json:client.MinecraftMixin,pl:mixin:APP:immersiveengineering.mixins.json:accessors.client.MinecraftAccess,pl:mixin:APP:assets/botania/botania.mixins.json:AccessorMinecraft,pl:mixin:APP:create.mixins.json:WindowResizeMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.main.Main.main(Main.java:184) ~[1.16.5.jar:?] {re:classloading,pl:runtimedistcleaner:A}
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_242] {}
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_242] {}
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_242] {}
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_242] {}
at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51) ~[forge-1.16.5-36.2.2.jar:36.2] {}
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-8.0.9.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-8.0.9.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-8.0.9.jar:?] {}
at cpw.mods.modlauncher.Launcher.run(Launcher.java:82) [modlauncher-8.0.9.jar:?] {re:classloading}
at cpw.mods.modlauncher.Launcher.main(Launcher.java:66) [modlauncher-8.0.9.jar:?] {re:classloading}

A detailed walkthrough of the error, its code path and all known details is as follows:

-- Head --
Thread: Render thread
Stacktrace:
at java.util.Objects.requireNonNull(Objects.java:290) ~[?:1.8.0_242] {}
-- MOD supplementaries --
Details:
Mod File: supplementaries-1.16.5-0.15.0.jar
Failure message: Supplementaries (supplementaries) encountered an error during the load_registries event phase
java.lang.NullPointerException: Registry Object not present: decorative_blocks:chandelier
Mod Version: 1.16.5-0.15.0
Mod Issue URL: https://www.curseforge.com/minecraft/mc-mods/supplementaries/issues
Exception message: java.lang.NullPointerException: Registry Object not present: decorative_blocks:chandelier
Stacktrace:
at java.util.Objects.requireNonNull(Objects.java:290) ~[?:1.8.0_242] {}
at net.minecraftforge.fml.RegistryObject.get(RegistryObject.java:120) ~[forge:?] {re:mixin,re:classloading}
at net.mehvahdjukaar.supplementaries.compat.decorativeblocks.DecoBlocksCompatRegistry.registerBlocks(DecoBlocksCompatRegistry.java:45) ~[supplementaries:1.16.5-0.15.0] {re:classloading,pl:object_holder_definalize:A}
at net.mehvahdjukaar.supplementaries.compat.CompatHandler.registerOptionalBlocks(CompatHandler.java:48) ~[supplementaries:1.16.5-0.15.0] {re:classloading}
at net.mehvahdjukaar.supplementaries.setup.Registry.registerCompatBlocks(Registry.java:139) ~[supplementaries:1.16.5-0.15.0] {re:mixin,re:classloading}
at net.minecraftforge.eventbus.ASMEventHandler_360_Registry_registerCompatBlocks_Register.invoke(.dynamic) ~[?:?] {}
at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:85) ~[eventbus-4.0.0.jar:?] {}
at net.minecraftforge.eventbus.EventBus.post(EventBus.java:302) ~[eventbus-4.0.0.jar:?] {}
at net.minecraftforge.eventbus.EventBus.post(EventBus.java:283) ~[eventbus-4.0.0.jar:?] {}
at net.minecraftforge.fml.javafmlmod.FMLModContainer.acceptEvent(FMLModContainer.java:120) ~[forge:36.2] {re:classloading}
at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$4(ModContainer.java:121) ~[forge:?] {re:classloading}
at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1640) ~[?:1.8.0_242] {}
at net.minecraftforge.fml.ModWorkManager$SyncExecutor.driveOne(ModWorkManager.java:56) ~[forge:?] {re:classloading}
at net.minecraftforge.fml.ModWorkManager$DrivenExecutor.drive(ModWorkManager.java:40) ~[forge:?] {re:classloading}
at net.minecraftforge.fml.ModLoader.waitForTransition(ModLoader.java:249) ~[forge:?] {re:classloading}
at net.minecraftforge.fml.ModLoader.dispatchAndHandleError(ModLoader.java:236) ~[forge:?] {re:classloading}
at net.minecraftforge.fml.ModLoader.gatherAndInitializeMods(ModLoader.java:202) ~[forge:?] {re:classloading}
at net.minecraftforge.fml.client.ClientModLoader.lambda$begin$1(ClientModLoader.java:103) ~[forge:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraftforge.fml.client.ClientModLoader.lambda$createRunnableWithCatch$4(ClientModLoader.java:123) ~[forge:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraftforge.fml.client.ClientModLoader.begin(ClientModLoader.java:103) ~[forge:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.(Minecraft.java:437) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:randompatches.mixins.json:client.MinecraftMixin,pl:mixin:APP:betterendforge.mixins.json:MinecraftMixin,pl:mixin:APP:flywheel.mixins.json:ShaderCloseMixin,pl:mixin:APP:biomancy.mixins.json:client.MinecraftMixin,pl:mixin:APP:kubejs-common.mixins.json:MinecraftMixin,pl:mixin:APP:abnormals_core.mixins.json:client.MinecraftMixin,pl:mixin:APP:immersiveengineering.mixins.json:accessors.client.MinecraftAccess,pl:mixin:APP:assets/botania/botania.mixins.json:AccessorMinecraft,pl:mixin:APP:create.mixins.json:WindowResizeMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.main.Main.main(Main.java:149) ~[1.16.5.jar:?] {re:classloading,pl:runtimedistcleaner:A}
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_242] {}
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_242] {}
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_242] {}
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_242] {}
at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51) ~[forge-1.16.5-36.2.2.jar:36.2] {}
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-8.0.9.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-8.0.9.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-8.0.9.jar:?] {}
at cpw.mods.modlauncher.Launcher.run(Launcher.java:82) [modlauncher-8.0.9.jar:?] {re:classloading}
at cpw.mods.modlauncher.Launcher.main(Launcher.java:66) [modlauncher-8.0.9.jar:?] {re:classloading}

Fixed in latest build of Supplementaries