### Godot version

v4.1.dev.custom_build.a7276f1ce

### System information

Win10, AMD 2600, GeForce GTX 1060, Vulkan API 1.3.205

### Issue description

I can't get correct color data from an array of source_color type.
The color data is saved as **Color** in the file:
`shader_parameter/palette = [Color (1, 0, 0, 1), Color (0, 1, 0, 1), Color (0, 0, 1, 1)]`
Shouldn't it be saved as PackedColorArray?


### Steps to reproduce

1.Declare an array of source_color type.
2.Set colors.

### Minimal reproduction project

[shadertest.zip](https://github.com/godotengine/godot/files/11246504/shadertest.zip)

tk = _get_token();
		if (is_token_operator(tk.type)) {
			Expression o;
			o.is_op = true;
			switch (tk.type) {
				case TK_OP_EQUAL:
					o.op = OP_EQUAL;
					break;
				case TK_OP_NOT_EQUAL:
					o.op = OP_NOT_EQUAL;
					break;
				case TK_OP_LESS:
					o.op = OP_LESS;
					break;
				case TK_OP_LESS_EQUAL:
					o.op = OP_LESS_EQUAL;
					break;
				case TK_OP_GREATER:
					o.op = OP_GREATER;
					break;
				case TK_OP_GREATER_EQUAL:
					o.op = OP_GREATER_EQUAL;
					break;
				case TK_OP_AND:
					o.op = OP_AND;
					break;
				case TK_OP_OR:
					o.op = OP_OR;
					break;
				case TK_OP_ADD: