I was able to verify that the anomaly you mentioned also occurs sometimes on iPhone10 (my wife’s). Sometimes the close button worked in landscape view, but most of the time it did not. I couldn’t determine a pattern to the anomaly. I have no good suggestions on how to fix. I noticed you had Lazy Load enabled, so maybe try disabling that and see what happens. I’ve had some weird anomalies using Lazy Load. You could also try enabling/disabling Cache Bust in project prefs to see if that makes any difference.
Btw, below may be the post that @PeteSharp was referring to, but I’m not sure that’s your problem.
Good Luck finding problem. 