Spawners created in 5.1.2 cause error on shut down after upgrading to 5.1.4+

After updating from 5.1.2 to 5.1.4+ I get a spawner error on server shut down. Attached is a pastebin of the console print up for the error.

https://pastebin.com/YuV1r2TR

Are there config changes that need to be made? I just copied the documentation.

Edited Sep 23, 2022 by Nutmegan
Assignee Loading
Time tracking Loading