When I set the frame rate to unlimited and then press the play button and come back, these lines appear. But I haven’t experienced this issue in other tabs yet. When I cap it at 60 FPS, it gets fixed.
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Duplicate of MCPE-188337
I did some research and noticed that this happens when the improved input response setting is enabled. However, the fact that it only occurs after pressing the play button still means that it needs further improvement on the software side.