### 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)

String str;
					while (is_ascii_identifier_char(GETCHAR(0))) {
						str += char32_t(GETCHAR(0));
						char_idx++;
					}
					
					
					int idx = 0;
					while (keyword_list[idx].text) {
						if (str == keyword_list[idx].text) {
							return _make_token(keyword_list[idx].token);
						}
						idx++;
					}
					str = str.replace("dus_", "_");
					return _make_token(TK_IDENTIFIER, str);
				}
				if (GETCHAR(0) > 32) {
					return _make_token(TK_ERROR, "Tokenizer: Unknown character #" + itos(GETCHAR(0)) + ": '" + String::chr(GETCHAR(0)) + "'");
				} else {
					return _make_token(TK_ERROR, "Tokenizer: Unknown character #" + itos(GETCHAR(0)));
				}
			} break;
		}
	}
	ERR_PRINT("BUG");
	return Token();
#undef GETCHAR
}
bool ShaderLanguage::_lookup_next(Token &r_tk) {