It goes like this:

- use 1st cord

- let another character (not Bernard) try to get the 2nd

You'll have the 2nd cord duplicated, one automaticly used and the other one at the inventory.

I can confirm this bug. Still there.

That issue is now fixed with the latest version: https://catmic.itch.io/return-of-the-tentacle/devlog/52208/version-111 

Thanks a lot for reporting!