Not sure if you can fix this in the plugin or I need to use another plugin to unlock the ability again.

I'll look into it. 

The latest game update changed ItemContainer.onlyAllowedItem to an array called ItemContainer.onlyAllowedItems[] so it might be related to that.

I came here to raise the same issue, I noticed that a new hook was also added with the latest Oxide patch, not sure if that may help.

• Add CanItemBeRecycled hook
• - bool CanBeRecycled(Item item, Recycler recycler)

Looks like I will have to write a new method to replace the Recycler's inventory.canAcceptItem.

the plugin is still not working

The plugin needs to be updated. Or Facepunch needs to revert their changes (not gonna happen).

Sorry for the long delay.  Finally updated the plugin to work again, using the new CanBeRecycled hook.