I loaded up a 1.13.2 test world to do some profiling, but it always crashes. Here's the end of the system log when it crashes:

[14:02:02] [Server thread/INFO]: theosib joined the game
[14:02:12] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 2120ms or 42 ticks behind
[14:02:43] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 2113ms or 42 ticks behind
[14:03:38] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 11802ms or 236 ticks behind
[14:03:45] [Server thread/WARN]: Fetching addPacket for removed entity
[14:03:51] [Server thread/ERROR]: Encountered an unexpected exception
m: Ticking block entity
at net.minecraft.server.MinecraftServer.b(SourceFile:820) ~[minecraft_server.19w12a.jar:?]
at ue.b(SourceFile:343) ~[minecraft_server.19w12a.jar:?]
at net.minecraft.server.MinecraftServer.a(SourceFile:755) ~[minecraft_server.19w12a.jar:?]
at net.minecraft.server.MinecraftServer.run(SourceFile:630) [minecraft_server.19w12a.jar:?]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_171]
Caused by: java.lang.NullPointerException
at ev.<init>(SourceFile:52) ~[minecraft_server.19w12a.jar:?]
at bso.i(SourceFile:194) ~[minecraft_server.19w12a.jar:?]
at bso.g(SourceFile:104) ~[minecraft_server.19w12a.jar:?]
at bgf.K(SourceFile:620) ~[minecraft_server.19w12a.jar:?]
at vd.a(SourceFile:401) ~[minecraft_server.19w12a.jar:?]
at net.minecraft.server.MinecraftServer.b(SourceFile:816) ~[minecraft_server.19w12a.jar:?]
... 4 more
[14:03:51] [Server thread/ERROR]: This crash report has been saved to: /home/minecraft/snapshot_test/./crash-reports/crash-2019-03-20_14.03.51-server.txt
[14:03:51] [Server thread/INFO]: Stopping server
...

The crash report is attached. The world download is available upon request via Discord.