https://pastebin.com/wwDyEN7b
It seems the changes first introduced in build 135 cause crashes regarding banners. When having the server running with a player standing still, it seems to randomly crash without the player ever moving or doing anything.
136
Possibly related to issue #1336
duplicate of 1336, resolved in build 138
This issue brings shame to the name of 1337
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This issue brings shame to the name of 1337