Cleaned up project with better structure.

Scripts/UI/Inventory/InventoryDisplay.cs

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+using System;
+using Godot;
+
+public partial class InventoryDisplay : PanelContainer
+{
+	private PackedScene itemDisplayPrefab = ResourceLoader.LoadItemDisplay();
+	[Export] VBoxContainer itemList;
+	[Export] RichTextLabel inventorySpace;
+
+	public override void _Ready()
+	{
+		GameData.inventory.OnInventoryUpdate += OnInventoryUpdate;
+	}
+
+	public override void _ExitTree()
+	{
+		GameData.inventory.OnInventoryUpdate -= OnInventoryUpdate;
+	}
+
+	public override void _Notification(int id)
+	{
+		if (id == NotificationVisibilityChanged)
+		{
+			if (!Visible) return;
+
+			ReloadItems();
+			UpdateInventorySpace();
+		}
+	}
+
+	private void UpdateInventorySpace()
+	{
+		inventorySpace.Text = $"Used space: {GameData.inventory.items.Count}/{GameData.inventory.maxInventorySize}";
+	}
+
+	public void ReloadItems()
+	{
+		foreach (Node node in itemList.GetChildren())
+		{
+			itemList.RemoveChild(node);
+			node.QueueFree();
+		}
+
+		ItemDisplay display;
+
+		foreach (Item item in GameData.inventory.items)
+		{
+			display = itemDisplayPrefab.Instantiate<ItemDisplay>();
+			display.item = item;
+			display.text.Text = item.data.GetReadableName();
+			display.amount.Text = $"{item.currentAmount}/{item.data.StackSize}";
+			display.texture.Texture = ResourceLoader.LoadPath(item.data.Texture);
+			itemList.AddChild(display);
+		}
+	}
+
+	public void OnInventoryUpdate(object sender, EventArgs args)
+	{
+		ReloadItems();
+		UpdateInventorySpace();
+	}
+}

Scripts/UI/Inventory/InventoryDisplay.cs.uid

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+uid://com0u7nqag6pp

Scripts/UI/Inventory/ItemDisplay.cs

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+using Godot;
+
+public partial class ItemDisplay : PanelContainer
+{
+	[Export] public TextureRect texture;
+	[Export] public RichTextLabel text;
+	[Export] public RichTextLabel amount;
+	public Item item;
+}

Scripts/UI/Inventory/ItemDisplay.cs.uid

@@ -0,0 +1 @@
+uid://qdjn5oqn6p5d