While this is a spigot server, the stack trace contains nothing but minecraft classes (except for the HashMap class). This issue occurs not only with furnaces as the block but some have been on hoppers, and one was just Description: Exception ticking world
One of the crash reports can be found at:
https://gist.github.com/blarosen95/f2072d8413d1dba4b0525bc86ce4db55
Comments 4
at net.minecraft.server.v1_13_R2.MinecraftServer.run
That's Spigot not Minecraft. Even if it was a Minecraft crash, it would still be invalid. Make a bug report here.
Spigot makes a lot of changes to a ton of other things, and this crash is in an area that almost certainly is modified by them. And it's clear from other parts of it that it's not a vanilla report, so just having snipped out that bit wouldn't have tricked us.
The spigot team has a bug tracker over here; you can use that. Alternatively, if you can actually reproduce this issue in vanilla, let us know.
Thank you for your report!
However, this issue is Invalid.
Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.
Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the creator of the plugin or resource pack.
If you have problems on large servers, such as The Hive and Hypixel, please contact them first as they run modified server software.
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