Glitch fox on MCPE, no texture, addon, command block

Pretty sure it's either your Resource pack has some problem or you re-enter the game thus make Minecraft re-render everything and cause the bugs. I've never seen a visual bug related to Seed before

Thank you for your report!
We're actually already tracking this issue at MCPE-66685, so I will resolve and link this ticket as a duplicate.

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when i played that world, i brother in MCPE saw the glitched fox. But in the same time, i also played on that world, i didn't saw the glutched fox in Windows 10, but is that a bug?