As described in https://github.com/electron/electron/pull/13769, we had to disable mixed sandbox related tests for Windows CI. We should re-enable them back after finding out the root reason.
atom/app/atom_main_delegate.cc
#include "atom/utility/atom_content_utility_client.h"
#include "base/command_line.h"
#include "base/debug/stack_trace.h"
#include "base/environment.h"
#include "base/logging.h"
#include "base/mac/bundle_locations.h"
#include "base/path_service.h"
#include "chrome/common/chrome_paths.h"
#include "content/public/common/content_switches.h"
#include "electron/buildflags/buildflags.h"
#include "ipc/ipc_buildflags.h"
#include "services/service_manager/embedder/switches.h"
#include "services/service_manager/sandbox/switches.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/base/ui_base_switches.h"
#if BUILDFLAG(IPC_MESSAGE_LOG_ENABLED)
#define IPC_MESSAGE_MACROS_LOG_ENABLED
#include "content/public/common/content_ipc_logging.h"
#define IPC_LOG_TABLE_ADD_ENTRY(msg_id, logger) \
  content::RegisterIPCLogger(msg_id, logger)
#include "atom/common/common_message_generator.h"
#endif
#if defined(OS_MACOSX)
#include "atom/app/atom_main_delegate_mac.h"
#endif
namespace atom {
namespace {
const char* kRelauncherProcess = "relauncher";
bool IsBrowserProcess(base::CommandLine* cmd) {