What I've done in order :
I've replaced my server.1.12.2.jar by the new server.1.13.jar
runned the server
successfully logged in
my world seems fine ( still have everythin , house etc )
start exploring ocean on a boat
then the server started to crash. now in infinite loop while logging
Environment
Minecraft Version: 1.13
Operating System: Linux (amd64) version 4.15.0-23-generic
Java Version: 1.8.0_171, Oracle Corporation
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 1810906896 bytes (1727 MB) / 2653421568 bytes (2530 MB) up to 2796552192 bytes (2667 MB)
JVM Flags: 2 total; -Xms2048M -Xmx3000M
Profiler Position: N/A (disabled)
Player Count: 1 / 100; [te['AG_6'/237, l='world', x=187.99, y=62.07, z=266.97]]
Data Packs: vanilla
Is Modded: Unknown (can't tell)
Type: Dedicated Server (map_server.txt)
Thank you for your report!
However, this issue is a Duplicate of MC-63590.
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