I didn't experience it myself, but I have seen a few people post about it. It's a glitch on certain devices which makes certain objects invisible.
While it might not work for some people, the easiest way is to just tap all over the screen during that mission, as the hitboxes for tappable objects are still there and should still count.
If that doesn't work, the only other way is to use your account on another device, or to try an emulator on pc so that you can get past that point. For example I use bluestacks emulator, and that room was visible for me.