The first time I went to the Nether in the new snapshot, I experienced something terrible.
It just didn't load the chunks which made the other mobs not respond. That is very frustrating because I wanted to have a blaze spawner far from the nether portal. Also, the effects with what I wanted to make, didn't do what I wanted it to do.
I actually didn't check the End yet.
The Speed Block file has both resource and data.
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Duplicate of MC-214808.

Dupe of MC-214808