After upgrading my mod from 1.16.5 to 1.20.1 game crashes.

After upgrading my mod from 1.16.5 to 1.20.1 I can no longer create new worlds or join them without the game crashing. It talks about a deleted mod element though I didn't delete anything. 

Time: 2024-03-17 14:02:30
Description: mouseClicked event handler
java.lang.IllegalStateException: Item: fors2:deleted_mod_element does not exist
at net.minecraft.world.item.crafting.SimpleCookingSerializer.lambda$fromJson$0(SimpleCookingSerializer.java:33) ~[forge-1.20.1-47.2.0_mapped_official_1.20.1-recomp.jar:?] {re:classloading}