### 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)

} break;
		case OP_ASSIGN_SHIFT_LEFT:
		case OP_ASSIGN_SHIFT_RIGHT:
		case OP_SHIFT_LEFT:
		case OP_SHIFT_RIGHT: {
			if ((!p_op->arguments[0]->is_indexed() && p_op->arguments[0]->get_array_size() > 0) || (!p_op->arguments[1]->is_indexed() && p_op->arguments[1]->get_array_size() > 0)) {
				break; 
			}
			DataType na = p_op->arguments[0]->get_datatype();
			DataType nb = p_op->arguments[1]->get_datatype();
			if (na == TYPE_INT && nb == TYPE_INT) {
				valid = true;
				ret_type = TYPE_INT;
			} else if (na == TYPE_IVEC2 && nb == TYPE_INT) {
				valid = true;
				ret_type = TYPE_IVEC2;
			} else if (na == TYPE_IVEC3 && nb == TYPE_INT) {
				valid = true;
				ret_type = TYPE_IVEC3;
			} else if (na == TYPE_IVEC4 && nb == TYPE_INT) {
				valid = true;
				ret_type = TYPE_IVEC4;
			} else if (na == TYPE_IVEC2 && nb == TYPE_IVEC2) {
				valid = true;
				ret_type = TYPE_IVEC2;
			} else if (na == TYPE_IVEC3 && nb == TYPE_IVEC3) {
				valid = true;
				ret_type = TYPE_IVEC3;
			} else if (na == TYPE_IVEC4 && nb == TYPE_IVEC4) {
				valid = true;