### 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)

vdnode->declarations.push_back(decl);
				p_block->variables[name] = var;
				is_const_decl = false;
				if (!fixed_array_size) {
					array_size = 0;
				}
				if (tk.type == TK_SEMICOLON) {
					break;
				} else if (tk.type != TK_COMMA) {
					_set_expected_error(",", ";");
					return ERR_PARSE_ERROR;
				}
			} while (tk.type == TK_COMMA); 
#ifdef DEBUG_ENABLED
			keyword_completion_context = CF_BLOCK;
#endif 
			p_block->statements.push_back(static_cast<Node *>(vdnode));
		} else if (tk.type == TK_CURLY_BRACKET_OPEN) {
			
			BlockNode *block = alloc_node<BlockNode>();
			block->parent_block = p_block;
			if (_parse_block(block, p_function_info, false, p_can_break, p_can_continue) != OK) {
				return ERR_PARSE_ERROR;
			}
			p_block->statements.push_back(block);
		} else if (tk.type == TK_CF_IF) {
			
			tk = _get_token();
			if (tk.type != TK_PARENTHESIS_OPEN) {
				_set_expected_after_error("(", "if");