### 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)

if (keyword_completion_context & CF_PRECISION_MODIFIER) {
						keyword_completion_context ^= CF_PRECISION_MODIFIER;
					}
					if (_lookup_next(next)) {
						if (is_token_datatype(next.type)) {
							keyword_completion_context = CF_UNSPECIFIED;
						}
					}
#endif 
				}
				if (shader->structs.has(tk.text)) {
					if (is_uniform) {
						_set_error(vformat(RTR("The '%s' data type is not supported for uniforms."), "struct"));
						return ERR_PARSE_ERROR;
					} else {
						_set_error(vformat(RTR("The '%s' data type is not allowed here."), "struct"));
						return ERR_PARSE_ERROR;
					}
				}
				if (!is_token_datatype(tk.type)) {
					_set_error(RTR("Expected data type."));
					return ERR_PARSE_ERROR;
				}
				type = get_token_datatype(tk.type);
				if (precision != PRECISION_DEFAULT && _validate_precision(type, precision) != OK) {
					return ERR_PARSE_ERROR;
				}
				if (type == TYPE_VOID) {
					_set_error(vformat(RTR("The '%s' data type is not allowed here."), "void"));
					return ERR_PARSE_ERROR;