Apps is not available for air-gapped Rancher 2.7.0


I need to install istio on air-gapped Rancher 2.7.0. But when I click to install it shows “Loading” and it takes 3-5 min then, the page refreshes and goes back to the same screen with no results. If try 10-20 times you may go further, but it hangs on a next step, so I don’t consider feature on working condition.
I launched Rancher container with CATTLE_SYSTEM_CATALOG=bundled variable.