No. I'm just using vanilla creative mode. It also applies when in survival.
EDIT: I actually forgot that I was using the Conduit Power.
Uploaded short video. Can confirm for 1.13.1.
Okay, thanks.
I attached the data pack. I was customizing the Terracotta (not glazed) files in the minecraft folder.
I tested it in 18w31a, and it doesn't crash with or without the data pack.
The player arm animation only gets broken when I use the Conduit Power with this command: /effect give <username> minecraft:conduit power 100000 100 true.