It seems that zombie pigmen are not spawning as frequently as they should. I noticed this issue when I tried to use my zombie pigmen farm wich worked great before the 1.11 pre1. This issue can also be noticed while walking through the nether as they're is almost no zombie pigmen to be seen.
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SunCat
Dupe of MC-2536
This can be set as resolved, I changed my viewing distance and it fixed the issue. I'll do more testing before posting a bug next time!