Using FD 0.3.2 and FDI 1.0.2, and I use both Decorative Blocks and BetterEnd Forge, but not Infernal Expansion.
When I start the game, I can enter a world just fine, but when I exit the world and try to open it again, or create a new world after having exited, I get an error about "errors in selected datapacks" and it doesn't allow me to proceed.
The error appears to be caused by the Infernal Expansion compat since I don't have said mod, though I'm not sure why this only occurs after I first leave a world then try to enter again without closing Minecraft.

[16:52:49] [Render thread/ERROR] [minecraft/TagCollectionReader]: Couldn't load block tag farmersdelight:heat_sources as it is missing following references: #farmersdelight:tray_heat_sources (from FarmersDelight-1.16.3-0.3.2.jar) [16:52:49] [Render thread/ERROR] [minecraft/TagCollectionReader]: Couldn't load block tag farmersdelight:tray_heat_sources as it is missing following references: infernalexp:campfire_glow (from farmersdelightintegration-1.16.5-1.0.2.jar) [16:52:49] [Render thread/WARN] [minecraft/Minecraft]: Failed to load datapacks, can't proceed with server load java.util.concurrent.ExecutionException: java.lang.IllegalStateException: Missing required tags: minecraft:block:farmersdelight:heat_sources,minecraft:block:farmersdelight:tray_heat_sources at java.util.concurrent.CompletableFuture.reportGet(Unknown Source) ~[?:1.8.0_281] {} at java.util.concurrent.CompletableFuture.get(Unknown Source) ~[?:1.8.0_281] {} at net.minecraft.client.Minecraft.func_238189_a_(Minecraft.java:1864) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:notenoughcrashes.mixins.json:client.MixinMinecraftClient,pl:mixin:APP:randompatches.mixins.json:client.MinecraftMixin,pl:mixin:APP:betterendforge.mixins.json:MinecraftMixin,pl:mixin:APP:outer_end.mixins.json:BackgroundMusicMixin,pl:mixin:APP:immersiveengineering.mixins.json:accessors.client.MinecraftAccess,pl:mixin:APP:fabrication.mixins.json:a_fixes.uncap_menu_fps.MixinMinecraftClient,pl:mixin:A,pl:runtimedistcleaner:A} at net.minecraft.client.Minecraft.loadWorld(Minecraft.java:1712) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:notenoughcrashes.mixins.json:client.MixinMinecraftClient,pl:mixin:APP:randompatches.mixins.json:client.MinecraftMixin,pl:mixin:APP:betterendforge.mixins.json:MinecraftMixin,pl:mixin:APP:outer_end.mixins.json:BackgroundMusicMixin,pl:mixin:APP:immersiveengineering.mixins.json:accessors.client.MinecraftAccess,pl:mixin:APP:fabrication.mixins.json:a_fixes.uncap_menu_fps.MixinMinecraftClient,pl:mixin:A,pl:runtimedistcleaner:A} at net.minecraft.client.Minecraft.func_238192_a_(Minecraft.java:1685) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:notenoughcrashes.mixins.json:client.MixinMinecraftClient,pl:mixin:APP:randompatches.mixins.json:client.MinecraftMixin,pl:mixin:APP:betterendforge.mixins.json:MinecraftMixin,pl:mixin:APP:outer_end.mixins.json:BackgroundMusicMixin,pl:mixin:APP:immersiveengineering.mixins.json:accessors.client.MinecraftAccess,pl:mixin:APP:fabrication.mixins.json:a_fixes.uncap_menu_fps.MixinMinecraftClient,pl:mixin:A,pl:runtimedistcleaner:A} at net.minecraft.client.gui.screen.CreateWorldScreen.func_195352_j(CreateWorldScreen.java:260) ~[?:?] {re:classloading,pl:runtimedistcleaner:A} at net.minecraft.client.gui.screen.CreateWorldScreen.lambda$init$11(CreateWorldScreen.java:205) ~[?:?] {re:classloading,pl:runtimedistcleaner:A} at net.minecraft.client.gui.widget.button.Button.func_230930_b_(SourceFile:33) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B} at net.minecraft.client.gui.widget.button.AbstractButton.func_230982_a_(SourceFile:16) ~[?:?] {re:classloading,re:mixin} at net.minecraft.client.gui.widget.Widget.func_231044_a_(Widget.java:136) ~[?:?] {re:classloading,pl:runtimedistcleaner:A,re:mixin,pl:runtimedistcleaner:A} at net.minecraft.client.gui.INestedGuiEventHandler.func_231044_a_(SourceFile:27) ~[?:?] {re:computing_frames,re:mixin,re:classloading} at net.minecraft.client.MouseHelper.lambda$mouseButtonCallback$0(MouseHelper.java:87) ~[?:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:bigbrain.mixins.json:MouseHelperMixin,pl:mixin:APP:randompatches.mixins.json:client.keybindings.MouseHelperMixin,pl:mixin:A,pl:runtimedistcleaner:A} at net.minecraft.client.gui.screen.Screen.func_231153_a_(Screen.java:427) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:computing_frames,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:quark.mixins.json:client.ScreenMixin,pl:mixin:APP:META-INF/consoleexperience.mixins.json:ScreenAccessorMixin,pl:mixin:A,pl:runtimedistcleaner:A} at net.minecraft.client.MouseHelper.func_198023_a(MouseHelper.java:85) ~[?:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:bigbrain.mixins.json:MouseHelperMixin,pl:mixin:APP:randompatches.mixins.json:client.keybindings.MouseHelperMixin,pl:mixin:A,pl:runtimedistcleaner:A} at net.minecraft.client.MouseHelper.lambda$null$4(MouseHelper.java:175) ~[?:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:bigbrain.mixins.json:MouseHelperMixin,pl:mixin:APP:randompatches.mixins.json:client.keybindings.MouseHelperMixin,pl:mixin:A,pl:runtimedistcleaner:A} at net.minecraft.util.concurrent.ThreadTaskExecutor.execute(SourceFile:94) ~[?:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B} at net.minecraft.client.MouseHelper.lambda$registerCallbacks$5(MouseHelper.java:174) ~[?:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:bigbrain.mixins.json:MouseHelperMixin,pl:mixin:APP:randompatches.mixins.json:client.keybindings.MouseHelperMixin,pl:mixin:A,pl:runtimedistcleaner:A} at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:36) ~[lwjgl-glfw-3.2.2.jar:build 10] {} at org.lwjgl.system.JNI.invokeV(Native Method) ~[lwjgl-3.2.2.jar:build 10] {} at org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:3174) ~[lwjgl-glfw-3.2.2.jar:build 10] {} at com.mojang.blaze3d.systems.RenderSystem.limitDisplayFPS(SourceFile:127) ~[?:?] {re:classloading,re:mixin} at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:999) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:notenoughcrashes.mixins.json:client.MixinMinecraftClient,pl:mixin:APP:randompatches.mixins.json:client.MinecraftMixin,pl:mixin:APP:betterendforge.mixins.json:MinecraftMixin,pl:mixin:APP:outer_end.mixins.json:BackgroundMusicMixin,pl:mixin:APP:immersiveengineering.mixins.json:accessors.client.MinecraftAccess,pl:mixin:APP:fabrication.mixins.json:a_fixes.uncap_menu_fps.MixinMinecraftClient,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:notenoughcrashes.mixins.json:client.MixinMinecraftClient,pl:mixin:APP:randompatches.mixins.json:client.MinecraftMixin,pl:mixin:APP:betterendforge.mixins.json:MinecraftMixin,pl:mixin:APP:outer_end.mixins.json:BackgroundMusicMixin,pl:mixin:APP:immersiveengineering.mixins.json:accessors.client.MinecraftAccess,pl:mixin:APP:fabrication.mixins.json:a_fixes.uncap_menu_fps.MixinMinecraftClient,pl:mixin:A,pl:runtimedistcleaner:A} at net.minecraft.client.main.Main.main(Main.java:184) ~[minecraft-1.16.5-client.jar:?] {re:classloading,re:mixin,pl:runtimedistcleaner:A,pl:mixin:A,pl:runtimedistcleaner:A} at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_281] {} at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_281] {} at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_281] {} at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_281] {} at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51) ~[forge-1.16.5-36.0.42-launcher.jar:36.0] {} at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-8.0.9.jar:?] {} at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-8.0.9.jar:?] {} at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-8.0.9.jar:?] {} at cpw.mods.modlauncher.Launcher.run(Launcher.java:82) [modlauncher-8.0.9.jar:?] {} at cpw.mods.modlauncher.Launcher.main(Launcher.java:66) [modlauncher-8.0.9.jar:?] {} at io.github.zekerzhayard.forgewrapper.installer.Main.main(Main.java:50) [ForgeWrapper-1.4.2.jar:?] {} at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_281] {} at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_281] {} at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_281] {} at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_281] {} at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:196) [NewLaunch.jar:?] {} at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:231) [NewLaunch.jar:?] {} at org.multimc.EntryPoint.listen(EntryPoint.java:143) [NewLaunch.jar:?] {} at org.multimc.EntryPoint.main(EntryPoint.java:34) [NewLaunch.jar:?] {} Caused by: java.lang.IllegalStateException: Missing required tags: minecraft:block:farmersdelight:heat_sources,minecraft:block:farmersdelight:tray_heat_sources at net.minecraft.tags.NetworkTagManager.lambda$reload$1(NetworkTagManager.java:47) ~[?:?] {re:classloading,pl:accesstransformer:B} at java.util.concurrent.CompletableFuture.uniAccept(Unknown Source) ~[?:1.8.0_281] {} at java.util.concurrent.CompletableFuture$UniAccept.tryFire(Unknown Source) ~[?:1.8.0_281] {} at java.util.concurrent.CompletableFuture$Completion.run(Unknown Source) ~[?:1.8.0_281] {} at net.minecraft.resources.AsyncReloader.func_219557_a(SourceFile:71) ~[?:?] {re:classloading} at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213166_h(SourceFile:144) ~[?:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B} at net.minecraft.util.concurrent.RecursiveEventLoop.func_213166_h(SourceFile:23) ~[?:?] {re:mixin,re:computing_frames,re:classloading} at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213168_p(SourceFile:118) ~[?:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B} at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213161_c(SourceFile:127) ~[?:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B} at net.minecraft.client.Minecraft.func_238189_a_(Minecraft.java:1863) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:notenoughcrashes.mixins.json:client.MixinMinecraftClient,pl:mixin:APP:randompatches.mixins.json:client.MinecraftMixin,pl:mixin:APP:betterendforge.mixins.json:MinecraftMixin,pl:mixin:APP:outer_end.mixins.json:BackgroundMusicMixin,pl:mixin:APP:immersiveengineering.mixins.json:accessors.client.MinecraftAccess,pl:mixin:APP:fabrication.mixins.json:a_fixes.uncap_menu_fps.MixinMinecraftClient,pl:mixin:A,pl:runtimedistcleaner:A} ... 40 more

I found this issue too when moving from forge 36.0.42 to 36.0.43. Seems that forge changed something about tags.
It doesn't create the world and it goes into a loop asking to load in safe mode, firing up this tag error every time.

I'm also having this issue.

Farmer's Delight Integration v1.0.2
Farmer's Delight v0.3.2
Forge 36.0.42

This is fixed in the latest version updated today