[MC-154499] Item frames in the world disappear and cause multiple error messages in the server console / Placing an item frame causes the client to crash

The bug

When an item frame is somewhere in the loaded parts of the world, the following error message appears in the server console:

Exception loading entity: 

java.lang.NullPointerException: null
	at ati.f(SourceFile:86) ~[server-1.14.3-pre3.jar:?]
	at ath.c(SourceFile:232) ~[server-1.14.3-pre3.jar:?]
	at ail.<init>(SourceFile:234) ~[server-1.14.3-pre3.jar:?]
	at ath.<init>(SourceFile:35) ~[server-1.14.3-pre3.jar:?]
	at ati.<init>(SourceFile:46) ~[server-1.14.3-pre3.jar:?]
	at aip.a(SourceFile:422) ~[server-1.14.3-pre3.jar:?]
	at aip.b(SourceFile:431) ~[server-1.14.3-pre3.jar:?]
	at java.util.Optional.map(Unknown Source) ~[?:1.8.0_201]
	at aip.a(SourceFile:431) ~[server-1.14.3-pre3.jar:?]
	at aip.b(SourceFile:484) ~[server-1.14.3-pre3.jar:?]
	at aip.a(SourceFile:465) ~[server-1.14.3-pre3.jar:?]
	at bya.a(SourceFile:393) ~[server-1.14.3-pre3.jar:?]
	at bya.b(SourceFile:151) ~[server-1.14.3-pre3.jar:?]
	at bxo.w(SourceFile:484) ~[server-1.14.3-pre3.jar:?]
	at uu.a(SourceFile:594) ~[server-1.14.3-pre3.jar:?]
	at com.mojang.datafixers.util.Either.lambda$mapLeft$0(Either.java:162) ~[server-1.14.3-pre3.jar:?]
	at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[server-1.14.3-pre3.jar:?]
	at com.mojang.datafixers.util.Either.mapLeft(Either.java:162) ~[server-1.14.3-pre3.jar:?]
	at uu.a(SourceFile:583) ~[server-1.14.3-pre3.jar:?]
	at java.util.concurrent.CompletableFuture.uniApply(Unknown Source) ~[?:1.8.0_201]
	at java.util.concurrent.CompletableFuture$UniApply.tryFire(Unknown Source) ~[?:1.8.0_201]
	at java.util.concurrent.CompletableFuture$Completion.run(Unknown Source) ~[?:1.8.0_201]
	at uw.b(SourceFile:57) ~[server-1.14.3-pre3.jar:?]
	at agq.e(SourceFile:83) [server-1.14.3-pre3.jar:?]
	at agq.a(SourceFile:123) [server-1.14.3-pre3.jar:?]
	at agq.run(SourceFile:91) [server-1.14.3-pre3.jar:?]
	at agn.h(SourceFile:135) [server-1.14.3-pre3.jar:?]
	at agn.p(SourceFile:114) [server-1.14.3-pre3.jar:?]
	at vg$a.p(SourceFile:506) [server-1.14.3-pre3.jar:?]
	at vg.d(SourceFile:234) [server-1.14.3-pre3.jar:?]
	at net.minecraft.server.MinecraftServer.aW(SourceFile:707) [server-1.14.3-pre3.jar:?]
	at net.minecraft.server.MinecraftServer.p(SourceFile:695) [server-1.14.3-pre3.jar:?]
	at agn.c(SourceFile:123) [server-1.14.3-pre3.jar:?]
	at net.minecraft.server.MinecraftServer.o(SourceFile:680) [server-1.14.3-pre3.jar:?]
	at net.minecraft.server.MinecraftServer.a(SourceFile:469) [server-1.14.3-pre3.jar:?]
	at net.minecraft.server.MinecraftServer.a(SourceFile:372) [server-1.14.3-pre3.jar:?]
	at ui.d(SourceFile:218) [server-1.14.3-pre3.jar:?]
	at net.minecraft.server.MinecraftServer.run(SourceFile:604) [server-1.14.3-pre3.jar:?]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_201]

As a result, the item frame that was about to be loaded will disappear.

When the client tries to place an item frame, the following error message will appear in the server console:

Error executing task on Server

java.lang.NullPointerException: null
	at ati.f(SourceFile:86) ~[1.14.3-pre3.jar:?]
	at ath.c(SourceFile:232) ~[1.14.3-pre3.jar:?]
	at ail.<init>(SourceFile:234) ~[1.14.3-pre3.jar:?]
	at ath.<init>(SourceFile:35) ~[1.14.3-pre3.jar:?]
	at ath.<init>(SourceFile:39) ~[1.14.3-pre3.jar:?]
	at ati.<init>(SourceFile:50) ~[1.14.3-pre3.jar:?]
	at bbw.a(SourceFile:40) ~[1.14.3-pre3.jar:?]
	at bce.a(SourceFile:189) ~[1.14.3-pre3.jar:?]
	at vk.a(SourceFile:312) ~[1.14.3-pre3.jar:?]
	at wa.a(SourceFile:951) ~[1.14.3-pre3.jar:?]
	at pi.a(SourceFile:36) ~[1.14.3-pre3.jar:?]
	at pi.a(SourceFile:10) ~[1.14.3-pre3.jar:?]
	at kd.a(SourceFile:15) ~[1.14.3-pre3.jar:?]
	at kd$$Lambda$3080/1958423162.run(Unknown Source) ~[?:?]
	at ri.run(SourceFile:18) ~[1.14.3-pre3.jar:?]
	at agn.h(SourceFile:135) [1.14.3-pre3.jar:?]
	at agr.h(SourceFile:23) [1.14.3-pre3.jar:?]
	at agn.p(SourceFile:114) [1.14.3-pre3.jar:?]
	at net.minecraft.server.MinecraftServer.aW(SourceFile:701) [1.14.3-pre3.jar:?]
	at net.minecraft.server.MinecraftServer.p(SourceFile:695) [1.14.3-pre3.jar:?]
	at agn.c(SourceFile:123) [1.14.3-pre3.jar:?]
	at net.minecraft.server.MinecraftServer.o(SourceFile:680) [1.14.3-pre3.jar:?]
	at net.minecraft.server.MinecraftServer.run(SourceFile:635) [1.14.3-pre3.jar:?]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_51]

Additionally, the client will crash with the following crash report.

Crash report

1.14.3 Pre-Release 3: crash-2019-06-14_11.35.28-client.txt

Description: Unexpected error

java.lang.NullPointerException: Unexpected error
	at ati.f(SourceFile:86)
	at ath.c(SourceFile:232)
	at ail.<init>(SourceFile:234)
	at ath.<init>(SourceFile:35)
	at ath.<init>(SourceFile:39)
	at ati.<init>(SourceFile:50)
	at bbw.a(SourceFile:40)
	at bce.a(SourceFile:189)
	at dhq.a(SourceFile:321)
	at cvo.aF(SourceFile:1335)
	at cvo.aG(SourceFile:1562)
	at cvo.m(SourceFile:1411)
	at cvo.e(SourceFile:925)
	at cvo.b(SourceFile:411)
	at net.minecraft.client.main.Main.main(SourceFile:154)

Original description

When updating the server to the latest 1.14.3 pre-release 3, at first start up the server console spams a lot of errors. After restart these errors are gone, but when logging on to the server, all item frames are gone.

Reproduce: put in latest world backup with item frames, then start server again. This will give multiple errors. When restarting there are no errors and all item frames are gone.

Also tested without datapacks, but still same issue

Client side: when placing item frame, the client crashes. This causes error on the server, but server remains running.

Client crash report included in attachments.