Well this is disturbingly unexpected. Crunchyroll will no longer stream the first seasons of Attack on Titan and My Hero Academia due to copyright issues stemming from the partnership breakup with Funimation. According to Anime News Network, Crunchyroll decided to remove the first seasons of the shows and is “currently working on the rights and will provide more details as they become available.” The remaining two seasons of both Attack on Titan and My Hero Academia will continue to be aired, however.
Funimation and Crunchyroll formed a partnership in 2016 to simulcast new anime, with Crunchyroll acquiring shows from Funimation. This union ended just two years later in November 2018. Attack on Titan began streaming on both Crunchyroll and Funimation in April 2013. My Hero Academia debuted exclusively on Funimation in 2017 after the partnership began. Both series were the few Funimation-licensed anime to remain on Crunchyroll following the end of their partnership.
Source: Anime News Network