If you download any PlayGround with Download button and then will try to open it you’ll get the error.
Seems the error relates to this new variable - Search · engineHost · GitHub
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Ooh that’s from a PR I made recently to let us stop the playground’s default render loop without having to use setTimeout… I didn’t think to handle and test the download feature because I don’t use it much, but I’ll look into it now and be back soon. 
EDIT: Okay I think I got it sorted and fixed now, but I still want to do some more testing after dinner, then will submit the PR later tonight.
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Okay here’s the PR fix, I think it’s good to go now:
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