Does this help?

https://www.reddit.com/r/BitcoinDiamond/comments/8girme/help_please_help_my_btc_was_stolen_from_diamond/

"I just had the same problem - I entered currently used seeds. I used the bitcoin diamond electrum wallet. I was able to recover bitcoin diamond from my Coinomi wallet. I was not able to recover bitcoin diamond from my Trezor. However, I later noticed that an amount of bitcoin corresponding to the amount of bitcoin diamond I received from my Coinomi wallet had been moved. I checked my Trezor and saw that all of the bitcoin had been moved. I'm hoping that my bitcoin was not hacked and somebody has a solution! "