Issue with client recognizing Lutri, the Spellchaser as a valid Companion.

On the deckbuilding page, the client tells you that you cannot have Lutri, the Spellchaser set as your Companion if you have a copy of Lutri within your maindeck, even if your deck otherwise meets Lutri's Companion requirements (each nonland card in your starting deck has a different name). Given that your Companion is not in your 'starting deck,' this is not the expected result.

Interestingly, if you load into a match with such a decklist (an otherwise Lutri-Legal list with a maindeck copy of Lutri,) you actually will have access to Lutri as your Companion in Game 1. During sideboarding, however, the deckbuilder produces the same issue and will not let you start Games 2 or 3 with Lutri as your Companion, even with an otherwise 'legal' deck.