The bug
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(from 1.11.2) crashes immediately on load. A similar world that worked fine in 17w48a also crashes immediately when opened in 17w49a.
Crash report
17w49a\: [^crash-2017-12-06_10.40.59-server.txt]
Description: Exception in server tick loop
java.lang.NullPointerException: Exception in server tick loop
at jx.<init>(SourceFile:47)
at nl.b(SourceFile:146)
at bme.b(SourceFile:87)
at bmi.a(SourceFile:76)
at bmi.a(SourceFile:53)
at bmi.a(SourceFile:34)
at qr.b(SourceFile:159)
at clf.a(SourceFile:96)
at clf.d(SourceFile:128)
at net.minecraft.server.MinecraftServer.run(SourceFile:467)
at java.lang.Thread.run(Thread.java:745)Description: Exception in server tick loop
java.lang.NullPointerException: Exception in server tick loop
at jx.<init>(SourceFile:47)
at nl.b(SourceFile:146)
at bme.b(SourceFile:87)
at bmi.a(SourceFile:76)
at bmi.a(SourceFile:53)
at bmi.a(SourceFile:34)
at qr.b(SourceFile:159)
at clf.a(SourceFile:96)
at clf.d(SourceFile:128)
at net.minecraft.server.MinecraftServer.run(SourceFile:467)
at java.lang.Thread.run(Thread.java:745)
added crash report