Fix getting struct elements from MonoArray (#11978)

* Fix getting struct elements from MonoArray
* Revert undesired change

modules/mono/mono_gd/gd_mono.cpp

@@ -285,7 +285,8 @@ bool GDMono::_load_assembly(const String &p_name, GDMonoAssembly **r_assembly) {
 	MonoAssembly *assembly = mono_assembly_load_full(aname, NULL, &status, false);
 	mono_assembly_name_free(aname);
 
-	ERR_FAIL_NULL_V(assembly, false);
+	if (!assembly)
+		return false;
 
 	uint32_t domain_id = mono_domain_get_id(mono_domain_get());
 

modules/mono/mono_gd/gd_mono_marshal.cpp

@@ -719,7 +719,7 @@ PoolColorArray mono_array_to_PoolColorArray(MonoArray *p_array) {
 	int length = mono_array_length(p_array);
 
 	for (int i = 0; i < length; i++) {
-		real_t *raw_elem = mono_array_get(p_array, real_t *, i);
+		real_t *raw_elem = (real_t *)mono_array_addr_with_size(p_array, sizeof(real_t) * 4, i);
 		MARSHALLED_IN(Color, raw_elem, elem);
 		ret.push_back(elem);
 	}
@@ -749,7 +749,7 @@ PoolVector2Array mono_array_to_PoolVector2Array(MonoArray *p_array) {
 	int length = mono_array_length(p_array);
 
 	for (int i = 0; i < length; i++) {
-		real_t *raw_elem = mono_array_get(p_array, real_t *, i);
+		real_t *raw_elem = (real_t *)mono_array_addr_with_size(p_array, sizeof(real_t) * 2, i);
 		MARSHALLED_IN(Vector2, raw_elem, elem);
 		ret.push_back(elem);
 	}
@@ -780,7 +780,7 @@ PoolVector3Array mono_array_to_PoolVector3Array(MonoArray *p_array) {
 	int length = mono_array_length(p_array);
 
 	for (int i = 0; i < length; i++) {
-		real_t *raw_elem = mono_array_get(p_array, real_t *, i);
+		real_t *raw_elem = (real_t *)mono_array_addr_with_size(p_array, sizeof(real_t) * 3, i);
 		MARSHALLED_IN(Vector3, raw_elem, elem);
 		ret.push_back(elem);
 	}