Hey there! It looks like this is just affecting world 349 due to an oversight (because of some changes we made to the world list to accomodate new worlds for ToA). This might be hotfixable (fixable today) but it is safer to coldfix (fixable on the next game reboot). As there might be more pressing bugs or issues relating to ToA that pop up throughout the day we'll keep this as a "known issue" for now which allows us to prioritise other hotfixes. Thank you for flagging it!
Edit: Just received information that this is also the case currently for World 353. We'll ensure to keep an eye on it!