### 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)

return ERR_PARSE_ERROR;
			}
			if (!is_do) {
				BlockNode *block = alloc_node<BlockNode>();
				block->parent_block = p_block;
				cf->expressions.push_back(n);
				cf->blocks.push_back(block);
				p_block->statements.push_back(cf);
				Error err = _parse_block(block, p_function_info, true, true, true);
				if (err) {
					return err;
				}
			} else {
				cf->expressions.push_back(n);
				cf->blocks.push_back(do_block);
				p_block->statements.push_back(cf);
				tk = _get_token();
				if (tk.type != TK_SEMICOLON) {
					_set_expected_error(";");
					return ERR_PARSE_ERROR;
				}
			}
		} else if (tk.type == TK_CF_FOR) {
			
			tk = _get_token();
			if (tk.type != TK_PARENTHESIS_OPEN) {
				_set_expected_after_error("(", "for");
				return ERR_PARSE_ERROR;
			}
			ControlFlowNode *cf = alloc_node<ControlFlowNode>();