Server log gets spammed after removing Eldritch Mobs

We used Eldritch Mobs for a while in our custom modpack but decided to remove it for now because most of the players didn't really like it. Now after removing the mod from the pack I noticed that the server log is getting spammed with the following messages:

`Failed to deserialize component: unregistered key eldritch_mobs:eldritch_modifiers`
And
`[Server thread/ERROR]: No codec for memory: minecraft:dummy; No codec for memory: minecraft:dummy; No codec for memory: minecraft:dummy; No codec for memory: minecraft:dummy`

I'm not sure if that second one has anything to do with it, but I'd like to a least fix the first one. Do I need to remove something else or is that because there are entities of the mod left?
This is on Minecraft 1.20.1 and we used the latest version as of writing this for that version.

Start by reproducing the reported log spam on Minecraft 1.20.1 with the latest Eldritch Mobs version mentioned, after removing the mod from the pack. Investigate whether the unregistered eldritch_mobs:eldritch_modifiers message is caused by remaining entities or another persisted resource, and determine whether the minecraft:dummy codec messages are related. Done means the cause and required cleanup or fix are documented and the repeated first error no longer occurs.

Written by the indexing model from the issue text.