Before I did that this way ( Your adviced helped me :) ) -> https://docs.elrond.com/sdk-and-tools/erdjs/erdjs-cookbook/#multi-esdt--nft-transfer
Now the sender is mandatory for Transaction class, so you recommend something like this -> https://docs.elrond.com/sdk-and-tools/erdjs/erdjs-cookbook/#contract-interactions ?
Nothing to do with the sender, to be honest I haven't played around with erdjs 11 yet, so not much I can say about the changes there :)