I'm having the same issue on my MP server as Assassinmaniac, where every time we try to place a second ingredient into the saucepan to make bonebroth, the game crashes. Here's the crash log:
Running on 64 bit Windows with 16 GB RAM
Version: v1.14.10 (Stable)5/30/2021 3:40:29 PM: Critical error occurred
System.NullReferenceException: Object reference not set to an instance of an object.
at Vintagestory.API.Common.CraftingRecipeIngredient.SatisfiesAsIngredient(ItemStack inputStack)
at ExpandedFoods.SimmerRecipe.Match(List`1 Inputs)
at ExpandedFoods.BlockSaucepan.GetMeltingDuration(IWorldAccessor world, ISlotProvider cookingSlotsProvider, ItemSlot inputSlot)
at Vintagestory.GameContent.BlockEntityFirepit.SetDialogValues(ITreeAttribute dialogTree)
at Vintagestory.GameContent.BlockEntityFirepit.OnSlotModifid(Int32 slotid)
at Vintagestory.API.Common.Action`1.Invoke(T t1)
at Vintagestory.API.Common.InventoryBase.DidModifyItemSlot(ItemSlot slot, ItemStack extractedStack)
at Vintagestory.GameContent.InventorySmelting.DidModifyItemSlot(ItemSlot slot, ItemStack extractedStack)
at Vintagestory.API.Common.ItemSlot.OnItemSlotModified(ItemStack sinkStack)
at Vintagestory.API.Common.ItemSlot.ActivateSlotRightClick(ItemSlot sourceSlot, ItemStackMoveOperation& op)
at Vintagestory.GameContent.ItemSlotWatertight.ActivateSlotRightClick(ItemSlot sourceSlot, ItemStackMoveOperation& op)
at Vintagestory.API.Common.InventoryBase.ActivateSlot(Int32 slotId, ItemSlot sourceSlot, ItemStackMoveOperation& op)
at Vintagestory.API.Client.GuiElementItemSlotGridBase.SlotClick(ICoreClientAPI api, Int32 slotId, EnumMouseButton mouseButton, Boolean shiftPressed, Boolean ctrlPressed, Boolean altPressed)
at Vintagestory.API.Client.GuiElementItemSlotGridBase.OnMouseDownOnElement(ICoreClientAPI api, MouseEvent args)
at Vintagestory.API.Client.GuiElement.OnMouseDown(ICoreClientAPI api, MouseEvent mouse)
at Vintagestory.API.Client.GuiComposer.OnMouseDown(MouseEvent mouseArgs)
at Vintagestory.API.Client.GuiDialog.OnMouseDown(MouseEvent args)
at Vintagestory.Client.NoObf.GuiManager.OnMouseDown(MouseEvent args)
at Vintagestory.Client.NoObf.ClientMain.OnMouseDown(MouseEvent args)
at Vintagestory.Client.NoObf.ClientPlatformWindows.Mouse_ButtonDown(Object sender, MouseButtonEventArgs e)
at System.EventHandler`1.Invoke(Object sender, TEventArgs e)
at System.EventHandler`1.Invoke(Object sender, TEventArgs e)
at OpenTK.Platform.Windows.WinGLNative.WindowProcedure(IntPtr handle, WindowMessage message, IntPtr wParam, IntPtr lParam)
at OpenTK.Platform.Windows.Functions.DispatchMessage(MSG& msg)
at OpenTK.Platform.Windows.WinGLNative.ProcessEvents()
at OpenTK.GameWindow.Run(Double updates_per_second, Double frames_per_second)
at _ISiSTzGmXXpAqo3PzdxdVD1bClZ._ofvn0Tr1zNGCbNV3SxvKs2MXNP(_C7CLMRbe3BejVtaARYCgl7Bg1vl , String[] )
at _0Y0SN1uu1V65pRLxvnN2xsIjXAg._ofvn0Tr1zNGCbNV3SxvKs2MXNP(ThreadStart )