Merge pull request #69259 from adamscott/fix-cyclic-reference-base-issue

Fix cyclic reference base being loaded but not valid (which is ok)

modules/gdscript/gdscript_cache.cpp

@@ -260,7 +260,7 @@ Ref<GDScript> GDScriptCache::get_full_script(const String &p_path, Error &r_erro
 	Ref<GDScript> script;
 	r_error = OK;
 	if (singleton->full_gdscript_cache.has(p_path)) {
-		script = Ref<GDScript>(singleton->full_gdscript_cache[p_path]);
+		script = singleton->full_gdscript_cache[p_path];
 		if (!p_update_from_disk) {
 			return script;
 		}

modules/gdscript/gdscript_compiler.cpp

@@ -2284,7 +2284,7 @@ Error GDScriptCompiler::_populate_class_members(GDScript *p_script, const GDScri
 					_set_error(vformat(R"(Could not find class "%s" in "%s".)", base->fully_qualified_name, base->path), nullptr);
 					return ERR_COMPILATION_FAILED;
 				}
-				ERR_FAIL_COND_V(!base->is_valid(), ERR_BUG);
+				ERR_FAIL_COND_V(!base->is_valid() && !base->reloading, ERR_BUG);
 			}
 
 			p_script->base = base;