Weird crashing terrain changes

Game froze, when got back onto single-player world part of end fortress i was in was mostly gone, in the spawn chunks, everything but torches and 1 dog was gone.

2016-09-25-05.log

[14:38:01] [Server thread/INFO]: Starting integrated minecraft server version 16w38a
[14:38:01] [Server thread/INFO]: Generating keypair
[14:38:01] [Server thread/INFO]: Preparing start region for level 0
[14:38:03] [Server thread/INFO]: Preparing spawn area: 0%
[14:38:04] [Server thread/INFO]: Preparing spawn area: 43%
[14:38:05] [Server thread/INFO]: Preparing spawn area: 85%
[14:38:05] [Server thread/INFO]: Changing view distance to 4, from 10
[14:38:07] [Server thread/WARN]: Invalid statistic in /Homes/cdp/Library/Application Support/minecraft/saves/SNAPS/stats/297e083e-9139-4569-b118-059ce6d1a33d.json: Don't know what stat.entityKilledBy.minecraft:spider is
[14:38:07] [Server thread/WARN]: Invalid statistic in /Homes/cdp/Library/Application Support/minecraft/saves/SNAPS/stats/297e083e-9139-4569-b118-059ce6d1a33d.json: Don't know what stat.killEntity.minecraft:enderman is
[14:38:07] [Server thread/WARN]: Invalid statistic in /Homes/cdp/Library/Application Support/minecraft/saves/SNAPS/stats/297e083e-9139-4569-b118-059ce6d1a33d.json: Don't know what stat.killEntity.minecraft:villager is
[14:38:07] [Server thread/WARN]: Invalid statistic in /Homes/cdp/Library/Application Support/minecraft/saves/SNAPS/stats/297e083e-9139-4569-b118-059ce6d1a33d.json: Don't know what stat.killEntity.minecraft:spider is

2016-09-25-06.log

[17:35:06] [Server thread/INFO]: Starting integrated minecraft server version 16w38a
[17:35:06] [Server thread/INFO]: Generating keypair
[17:35:08] [Server thread/INFO]: Preparing start region for level 0
[17:35:09] [Server thread/INFO]: Preparing spawn area: 0%
[17:35:10] [Server thread/ERROR]: Couldn't load chunk
f: Loading NBT data
	at dt.a(SourceFile:420) ~[16w38a.jar:?]
	at dt.a(SourceFile:71) ~[16w38a.jar:?]
	at dt.a(SourceFile:414) ~[16w38a.jar:?]
	at dt.a(SourceFile:71) ~[16w38a.jar:?]
	at ec.a(SourceFile:117) ~[16w38a.jar:?]
	at ec.a(SourceFile:82) ~[16w38a.jar:?]
	at ec.a(SourceFile:78) ~[16w38a.jar:?]
	at aud.a(SourceFile:66) ~[16w38a.jar:?]
	at lt.e(SourceFile:124) [16w38a.jar:?]
	at lt.b(SourceFile:81) [16w38a.jar:?]
	at lt.c(SourceFile:95) [16w38a.jar:?]
	at net.minecraft.server.MinecraftServer.l(SourceFile:330) [16w38a.jar:?]
	at cam.a(SourceFile:114) [16w38a.jar:?]
	at cam.j(SourceFile:130) [16w38a.jar:?]
	at net.minecraft.server.MinecraftServer.run(SourceFile:436) [16w38a.jar:?]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_74]
Caused by: java.util.zip.ZipException: incorrect data check
	at java.util.zip.InflaterInputStream.read(InflaterInputStream.java:164) ~[?:1.8.0_74]
	at java.io.BufferedInputStream.read1(BufferedInputStream.java:284) ~[?:1.8.0_74]
	at java.io.BufferedInputStream.read(BufferedInputStream.java:345) ~[?:1.8.0_74]
	at java.io.DataInputStream.readFully(DataInputStream.java:195) ~[?:1.8.0_74]
	at java.io.DataInputStream.readUTF(DataInputStream.java:609) ~[?:1.8.0_74]
	at java.io.DataInputStream.readUTF(DataInputStream.java:564) ~[?:1.8.0_74]
	at dt.b(SourceFile:407) ~[16w38a.jar:?]
	at dt.a(SourceFile:68) ~[16w38a.jar:?]
	at dz.a(SourceFile:66) ~[16w38a.jar:?]
	at dt.a(SourceFile:414) ~[16w38a.jar:?]
	... 15 more
[17:35:10] [Server thread/INFO]: Preparing spawn area: 29%
[17:35:10] [Server thread/WARN]: Wrong location! (0, 0) should