I think it's time to update the plugin:
If you set a manual x1 rate on a resource in a crate, then in airdrops and locked crates, for example, hqm and scrap might drop for 500-700, while scrap drops for 500-1000.
Prevent Duplicates doesn't work, but items are added to the general stack.
The blacklist doesn't work at all, and items also drop.

I have the same problem with blacklisting. Have you found a solution?

I am waiting for the update