While playing in creative mode looking at an Enderman would cause the Enderman's "angry" sound effect but very distorted and dragged out. I have no texurepacks enabled and this isn't the first time it has happened. It happen in 1.12 too. Here is a link to the video of this happening. Link: https://youtu.be/7bnHZZGVOLU
Thank you for your report!
We're already tracking this issue at MCPE-42977, so I will resolve and link this ticket as a duplicate.
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